Simon,
Any turbo button is a good button. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />
The extra rotation would have provided an increase in drive force (speed) and moved the drive further forward (less weather helm).
Maybe your sail/mast combination doesn't have too much bend either with varying amounts of downhaul.
Worth playing around with in light to medium wind strength but leave it alone in strong winds. <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" /> As Peter says, you would potentially risk mast failure or mast bend and it would be way too powerful. <img src="http://www.catsailor.com/forums/images/graemlins/confused.gif" alt="" />
Regards,
Peter <img src="http://www.catsailor.com/forums/images/graemlins/tongue.gif" alt="" />