The ProVari is a great piece of gear, I love mine but the chip just isn't designed for RBAs, it was made for cartos running from 1.5 ohms and up. Keep the resistance up on the RBAs and it is fine but if you want to run sub 1.2 ohm coils you need a different PV. Trying to teach a pig to sing just wastes your time and annoys the pig.