One thing that I might add is that instead of flagging your mainsail because you are trying to get the boom to the centerline, you might try really blading out the sail as suggested, minimizing twist, put on gobs of mainsheet, but lowering the traveler so the sail has a flatter angle of attack. You will get a little more drive, less drag and more style points. The other thing in a lot of breeze you can move your jib leads slightly aft and add twist to the genoa. This should reduce heeling and weather helm and may let you use your mainsail more effectively.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay