I'm having trouble getting a accustom to the rudder trim in my 150. It seems if i trim it for cruise flight when im doing slow flight etc even in left turns i have to put in right rudder to get the ball centered which is a very odd feeling when doing approach configuration turning stalls under the hood. I have a hard time pressing right rudder to go left. if I trim for slow flight I really have to hold my foot on the rudder for cruise flight. What is standard for trim? Trim it for cruise, Seems like I'm always messing with it depending on the situation because about half the time, I'm doing training and practicing various configurations and the other half Im going on cross country trips. is there Any way the ball could be off?