Seriously bro, you gotta get the 6/3 sweep bars. I know what you mean switching from Bayou's to 12 degree--cool feeling on some things while other tricks felt gross. I ended up ordering 0 sweep bars and rode 0 for like 4 years after that. Now get this: just this summer I bought the 8.5" Intrikat bars and have been super happy with them. I can't imagine myself ever going back to 0. Whiplashes, tailwhips (working on em), and all of my other front and back wheel tricks feel better than ever.
All in all, I say go for it. You won't regret the in-between feel of the 6 degree back sweep.