Keygrip - Wilco!
Just returned from another lesson and lo and behold it was the best lesson yet. My nightmare "trimming" was transformed into an object lesson - and my ten recoveries from a stall have to be seen to be believed. Total transformation. Before the lesson my FI somehow picked up on my "mood" (I wasn't even aware of one) and asked: Anything wrong? You seem subdued. I didn't want to get into an argument and just blurted out: Hmm, you ARE perceptive. Nothing further was said by either side.
Perhaps not quite what I should have said but it seems to have had a beneficial effect, and I have decided to give him "another chance".
Watch this space.