Firstly, I wouldn't worry about it too much. I don't think the cut of the mainsail would ever make the difference between going sailing and not going sailing. It's a question of how fast you'll go when you're out there, and even then the difference is not that much.

Secondly, a compromise between the two can be perfectly effective. I have the standard Ullman sails that came with the Blade, which I assume are a "compromise" cut. I am happier with the performance of the main when sailing 1-up, but at the level we sail at, it's perfectly competitive either way.

Paul