btw, just wanted to mention that with big genny's and tall thin mains a lot of the main's job seems to be to provide a proper 'slot' for the genny, the backwinding tells you that you are starting to 'infringe' on the slot, so if you touch the backwinding, then back off a bit, that is roughly equivalent to the old adage of getting proper main trim by letting the mainsheet out until it starts to luff, then bring it in just until it stops. good rules of thumb to start with at least.
Another way to extend traveller adjustment thinking past 'the slot' adjustment is to think of it as a way to control 'helm'. I first figure out the 'slot' placement, but if I start getting more than 5 degrees of helm I move further to leeward, if I start running out of track it was time to reef 5 minutes ago..
