i'm a 100% VG user also. i have found the vg is a little tough on cartos. which give me best taste, but i blow alot of cartos.
i have tried vivi novas, and they do ok, loose flavor quick.
as of right now, i'm using kanger protanks.
they are a bottom coil, and have a cool vape.
they're easy to use and fill. they do have 510 threads, but you can use an adapter.
they have a pyrex tank if you use harsh juice, it won't crack.
i used to add 2 drops of distilled water per tank to thin it a little, but have stopped doing that.
just constantly clean everything, especially before first use.
at least take a look at them.