"Hmmm, don't ever recall that type of action on my 6.0. If over powered letting the main off opened up the top of the sail dumping wind and depowering very nicely. I suspect if dumping the main powers and rounds you up that maybe you weren't trimmed properly to start (over trimmed a bit maybe, or maybe the sheeting angle wasn't set right)."

Keith
It is not a case of my trimming method stops rounding up - it just makes the boat GO faster.

I agree with Jake that the downhaul has to come it to play aswell

This does make sailing the 6.0 to windward a bit like working on a chain gang, but its pretty satisfying when it comes together