Maybe you should consider the dual coil rebuildable deck if you haven't already done so. That's what my wife runs in her TFV4.
I have been running the Mutation XL rda and it is a 3 post rda and can hold my 6/7th 22 ga. canthal wrap coils. I could chuck with that.Her dual deck produces clouds equivalent to almost any 22mm rda I've seen.