[Uhehner]

43 MPH ? WOW, you don't need trim tabs, you need flaps. From my experience weight distribution becomes a bigger problem when you are traveling that fast. I assume you have L&R props so its not a torque problem. Look at your water and waste tanks and batteries. Sounds like you need more weight on the port side. Try moving your passengers to the high side. And is it really a problem? How often do you run that fast?
Capt. George