I doubt I'm capable of 'earning my keep'... but I will tell you how I use them.
Do you treat these like an atty in that you "fire" it up momentarily before actually "hitting" it or will that put undo stress on it?
Personally, I don't bother with this... it just isn't necessary in my opinion. But I know others that do just the opposite.
What kind of draw do you put on these...2...3..6.seconds.
Since we are talkin' about the LR cartos here... I normally hit it for 4-5 seconds if I know it's good and full. Otherwise, the longer I use one... the shorter the hit gets for me!
How often do you top it off? It's pretty obvious when the top layer of filler becomes dry, but don't want to "overfill" either.
I'm one of those people that tops off my carto quite often! I normally will vape a good 10 times or so and be ready to set it down till next time. Before the next "session"... I top off with 6 drops or so, give or take, until I have that nice slurpy look on top.
As far as cleaning what do you recommend?
ABSOLUTELY NOTHING! I typically use a carto for about a week... depending on the juice I'm vaping in it. After a few days the juice will begin to darken each time you add juice, etc... yet I don't find it tastes bad until it gets really dark and burnt. I just don't push one past that point... nor do I waste time cleaning them. Not worth the hassle in my opinion. The one thing I always have handy is a large paperclip with the end bent out on it so I can stick through the center hole of the carto and give it a good wiggle around. This really helps to clean the airway and prolong the use!
As cheap as these things are, and for the consistancy they give me, I have not found anything else to replace them as of yet. Hope this helps at least a little!