@davenicoll I also have the Saitek trim wheel and it works correctly with Arrow III, as well as the other default MSFS aircraft. The aircraft trim wheel moves in the same direction as the Saitek wheel. Here is my Saitek configuration in CONTROLS OPTIONS...
A further experiment, just did the same sort of flight in another GA aircraft (Improved Bonanza) with the same result, I didn't expect that there was a problem with the Arrow III but just checking...I'm perplexed
Further digging reveals this to be a hardware issue, not caused by the Just Flight PA-28.
I'm using a trim wheel from Flight Illusion, and unfortunately they've coded it to engage when AP is turned on... which works poorly for a plane with no AP Elevator Control... 🙂 I've contacted their support to ask for an added option, to be used for planes like this. (they used to have that in their old software, but a "better" version has been released since)
@captainaye You are correct... the SET commands are intended to be assigned to the ON position of a toggle switch, and will operate the way you originally intended. But, I use the GEAR UP and GEAR DOWN commands assigned to the UP and DOWN positions of the landing gear toggle switch on the Honeycomb BRAVO throttle quadrant, which also works well.
@sender46 I have trim up/down on my yoke and I use it for certain things like establishing a climb or leveling off, but I'm watching the actual travel of the trim and I'm barely using any. It's not the "tap the button and get wild swings of +-600fpm" it was right after SU8, it just feels overly effective.
If I hold trim down for a second while leveling off, even backing off some forward pressure I'll still end up descending by a few hundred feet per minute.
In cruise I'm barely using forward of neutral trim, I used to need like half travel.