Had the same issues with IL2s last week. I really don't think its a stick setting issue- I landed nice and slow, put the wheels down without bouncing or coming down hard, put the brakes, on, tail came up, when the plane stopped, tail settled down and snapped right off. Did this 3 times in a row at one point. I wasn't flying the f6 when it was buggy, but it sounds like a very similar problem.
Cheers