Thanks guys, just thought I may have the wrong settings, but our letting full out is in that 60 - 90 degree range so we are'nt far off.

I've been playing travellor rather than main sheet, simply cleating the main at just off upwind tensions and letting the tell tails dictate the travellor settings.

Our courses are so short and congested with slower boats that sometimes it just better to get my head out of the boat and sail on a set tension than to bother to try and adjust all of the time.