Roger, I agree with you. The B4 rear end always seemed a little 'random' to me, would do the same thing on the same corner say 3 laps in a row, then would do something random the next lap. I always felt I really needed to be on top of it waiting for it to bite me.
However, I have tried almost everything this year, plus made my own car, and still don't know what I'll run next year
I might just have to get the B3 off the wall and give it a try, or perhaps a black tub team car
G