glamourgirlglock

You should build your own coils, they may a hell of alot longer. Have build mine and clean them with water every fourth day like New. It's been two months with the same one G. You tube

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Basically make sure your build can handle your amps output...**** tonne of info on YouTube mate

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Highly unlikely.  There's a lot involved, but to keep it short, if you are using a regulated mod you are very safe.  There is one mod out right now that seems to have a flaw.  The HCigar VT75C seems to have a problem with the battery housing.  If a long (66mm or longer) 26650 battery is used in the mod the top of the housing can become fatigued and short out the battery.  The battery/mod will melt down pretty quickly. 

As previously stated it's highly unlikely for a regulated mod to blow unless it has been damaged or if there is a flaw with the design. Most "mods" that blow are mechanicals and my view, based on the front line header news with barely any technical input, is that these are scare stories designed to turn people away from vaping.

Lol,  They're designed to sell Coca-Cola, or bonerall, or whatever the media's sponsorship is.  Shock and Awe!  "Look!  That there vapin thing just blew up in his face!  Give us your money!"

Are you sure it was a mod and not just an unprotected battery? Most of these stories include people putting batteries into their pocket with change that shorts out the battery until it explodes.

Regulated mods (ones where you set voltage/wattage/temperature) have a really good track record, but there's also that rare one that has a fault, or one that someone has modified or done something stupid with... 
Mechanical mods (where you press a button that makes the battery contact and complete a circuit) have a good track record too... IF THEY ARE USED CORRECTLY, and people aren't being stupid... like trying to fire a 0.05 Ohm coil, or using batteries that cannot handle the Amp demands their coil is pulling.  Explosions were still uncommon even years ago, before battery technology became better!
Like @Tam said, most problems are with cheap Chinese batteries, knock-off batteries, damaged batteries, or where someone pops a battery into their pocket or purse (unprotected) and loose metal manages to make contact between the positive and negative posts, creating a run-away discharge/venting.
There's no reason to panic... your mod is 99.9999% safe if used correctly AND you are using a good, reputable battery of the correct Amperage specification for your coil needs.  Stick with Samsung, LG, Sony, etc. batteries, and make sure they are at least 20A... and you should be fine for all your vaping needs.

Wattage is just the amount of power applied to the coil... Temp control limits the power applied by cutting the power once the desired temp is reached, then re-applying/balancing the power to the coil to maintain the desired temp.
In Temp Control mode, if you have the power set to 200W, and the temp only requires 50W, it will heat up fast (applying 200W), then turns the power off/on rapidly to maintain the temp.  If you have it set at 50W, then the heat-up will be slower, but the controller will not have to pulse the power on/off to maintain the temp.  
Does that make more sense?
In Wattage mode, the power you select (20W, 50W, 200W, etc) will be applied to the coil... and over-powering the coil will cause it to pop at worst, or burn up your coil/cotton at the very least.  This is why I suggested you start low and use trial-and-error to find your sweet-spot.  The same applies to TC mode... start at a low temp and adjust your temp higher and higher until you find the desired level.  If it heats up too quickly, or you see the mod is having to work hard to maintain the temp, back off the Wattage.  If you find raising your temp has no effect, then you may need to apply more wattage in order to reach that temp?
The stamps on the coils are just for reference... like a guideline, and make no difference whether in TC mode or Wattage mode.  Most of those stamped ranges are determined using zero-nic and an unknown PG/VG ratio (or just arbitrarily given, based on the Ohm-rating of the coil), so they will not be definitive ranges for the juice YOU are using.  Like I said, I have one coil that says 30W is the recommended low/minimum, but I find my juice is great at only 18W... 30W would burn it to a crisp!  Another coil I regularly use says 15W-40W as the recommended range, and I've used it at 50W with a high VG juice for fantastic flavor and vapor...

Right. I had watermelon and that's when I experienced the harshness. Then melon. So I switched back to strawberry cheesecake and strawberry custard and no harness there.

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Christopher hit the nail on the head with the two things that determine TH (throat hit / harshness).  
Since you're sure they are the same Nicotine strength and same PG/VG ratio's... the only other factor is the flavorings.  
Fruity juices (like your watermelon) tend to be a little more harsh, and bakery flavors tend to be a little more smooth... usually due to vanilla or custards in them.  When I vape bakery flavors, I tend to turn up my wattage just a bit because they have a lot of vanilla in them, and that requires more heat/power, more-so than my fruity flavors...  Fruity flavors do require less power/heat... This is "normal", so I'm guessing this may be exactly what you're experiencing?

Two things usually determine how much throat hit an eliquid will have, nicotine and PG ratio. If you have clear e liquids that seem to provide more throat hit than some of your other e liquids, it's likely that they have a higher PG than VG ratio. 

Sounds like your clear juices are a lower vg, like 50/50 and the tinted juices are 30pg/70vg. Juices with higher pg are a bit harsher.

I haven't paid attention to harshness vs tint of juice but I do use different power and or temperature on different juices.  The degree of harshness for me usually comes down to the nic level I'm vaping.