Personally I set force roll to 180º for climb and turn, keep acceleration between 15 and 17 m/s^2 and throttle over 66%. I also use smart parts for staging and turning on the gimbal for the SSME's at 3% fuel levels in the SRB/LRB's. The biggest help though was getting control surface toggle and using it to turn off everything except the second flap on the rudder, which you have to do manually, this keeps MechJeb from getting into a feedback loop. Hopefully this is helpful.