I second the notion that Couples is not playing against inferior competition. As stated, the one start he has not won, he lost shooting 21 under for three rounds to some guy named Watson. In Naples, he wins by one after Tommy Armour III shoots a friggin 61 the final day. In Newport he pretty much outclassed the field by averaging 66 for each of three rounds. And at Cap Cana, the field was so poor he had to shoot 62 the final round to come from behind to win by 2.
I would lean toward shorter golf courses and tournaments, less rough, and....the key.... he's putting great so far this year. If he keeps up the putting, it doesn't matter what tour he plays on this year, he'll continue to win.