Troy I might as well throw my two cents in for the little its worth . I use a 80% VG to 20% PG ratio and it works very well. Anything higher than an 80% VG based liquid is where you begin to have wicking issues. And as far as filling my cartos I use a syringe but I know that is not an option for many people. Oh ya, no VG or PG is totally 100%. There is as much as .5% of distilled water in what you get from suppliers. And If you do use distilled water, which I would not recommend either, do not go over 5%. Just stick to using PG like it was mentioned above.
What else. Some people put their cartos in a lanyard and spin it as well.
Oh and I see JuiceBlaster has some DIY game. When your doing DIY you have to consider all the variables, even what the flavoring your using consists of. Flavorings can contain PG, VG, distilled water, ethyl alcohol, PGA and Triecetin (its like glycerin).