Have you explored any other options besides the vamo, I currently use the "Sigelei V3 Flat Top Telescoping", Its a one button Mod But has all the features plus more, The damn thing is built like a tank and can fit several sizes of batteries. The kit is a little more money but you get everything you need to start vaping!
I'll be honest, my company sells them and here is the link, http://www.advancednictech.com/product-p/sig-zv3-t.htm but I'm not here to advertise I just wanna help and get to know my fellow vapors. There is a lot of companies that sell them though so look around and find the price and deal that fits.
Be careful If you buy the Vamo....there is a ton of copies and a very big difference in quality! I've tried 5 "vamos" and only stood behind 1
I know I really love mine and I have a lot of choices at my finger tips and this mod is my best bud, I always come back to it!
Dry mouth can be an effect of how the juice is mixed, depending on where you buy it and what flavors you like. Tobacco flavors effect me this way the most. I've switched to flavors with menthol or citrus and it helped a lot.
E-Juice is comprised of 2 "base" food grade liquids, Propylene glycol and Vegetable Glycerin. In my opionion the best mix for new users is 50/50. Its less harsh on your throat. Some companies do change the ratios in order to achieve a diff result. which is perfectly safe but can ruin your vaping experience if not done correctly. Also check your expiration dates on your juices, they do have a shelf life and its important to use fresh juice.
If you shop at a local retailer, let them know what your experiencing they may have a better flavor/mix that will help.
Don't Give Up! Try some diff. Juices and give them a chance if you try one and "kinda like it" get small bottle and vape it for a week the flavors tend to warm to yah after a while.
Just a side note.....not sure what your hardware is but cheap starter kits can cause a bad experience, don't be afraid to upgrade a little.