Why can't I play Turbos?

[ArtMonkRules]

I have a 62% win rate at the regular 5's and 10's (Stars - HUNL), but when I try to play the 6.50 and 11 turbos, my roi is barely over 6% for several hundred tournaments.... how can I be so solid at regular tournaments, and so bad at turbos? The players seem worse in the turbos! What startegy adjustments do you guys make when switching from one to the other?