Those of you with good memories will remember these photo's taken last year when I experimented with an AFC Blade mainsail. The foot must have been a foot shorter than my Landy's mainsail so the more pressure I put on the mainsheet the more the mast rotation decreased (due to the angle of the mainsheet blocks pulling the boom towards the rear beam). This wasn't the biggest problem though, due to this differing angle the mainsheet cleated automatically and I couldn't uncleat until I was back on the tramp. Hence in the second photo I'm desperately trying to uncleat the traveller which I didn't do quick enough and the PRO had to fend me off the Committee boat.
I know this story doesn't have anything to do with light wind sailing but the angle of the mainsheet from beam to boom does have an affect on mast rotation. They are also nice photo's of sunshine and sailing which is fairly rare in these parts.