@jmarkows " I need to keep putting on trim without any effect until I reach some critical mass and suddenly it's too much."
This happened to me just now trying to manually fly to set up an approach. I had engines at flight idle, speed at 250 kias, pull back on the elevator to take speed off as I'm trying to trim nose up. Finally get it close to profile, put a little power in and then its WAY too much. Could definitely be user error but doesn't seem right.