Hello Dan. Sorry, I’ve not logged on in a while. Still recovering from all of the fun with the Meyers group at Osh a few weeks ago. You can email me questions (firstname.lastname@example.org) about the trim system or I’ll keep an eye out here for any new posts. I have an A model with the hydraulic trim. EXTREMELY effective if the system is properly bled (like a brake master cylinder) and shouldn’t leak if you’ve been converted over to straight, non ashless dispersant 100 weight oil.
That said, Dean is right, biggest culprit would be improper flap rigging. Another really easy thing that might have been overlooked is a trim tab on the aft rear of the left wing out of adjustment?