They put rocker in the 311's and also I beleive the 336. They like LOTS of trim. I run mine almost off the indicators. Most don't trim them up enough so they will seem like the bow is stuck down.
I love TRS drives and think that the 311's/336's ride better with them. I have a 311 with 420's and TRS drives. The Bravo boats are easier to work on the front of the motors.