If changes in C/G do not remove the need for elevator trim, then there may be a need for a change in the incidence of the horizontal stabs. There have been few planes that I have seen that didn't require some mixing in one form or another to eliminate one bad habit or another. My personal experience is that a 232 is one that usually requires more than others until they become really large. 35% and up things seem to always go better with a straight 232.

The 232 is a plane that for some reason or another has an empennage that is extremely effective and very sensitive to small control inputs and variations in incidence. They take a lot of time and effort to get them where you want them but when set up well they perform great. Kind of like a pattern plane where the engine and main wing incidences are set to zero and the horizontal stabs have to be adjusted until that sweet spot is reached.