Well, I ain't no rocket scientist, but I think you are on the right thought process. In looking at that wheel thingamajigger, I would 'think' moving the spring up toward the top of the wheel may help. :eek:
Did that already and it didn't make a bit of difference. :D
Like I said earlier, at first I thought I just needed and stronger spring and that didn't do it either.
Just made the pedal stiffer, which I don't like as it just wears things like the shafts even quicker.
I'm pretty sure equalizing the side pull on the throttle shaft from one spring pulling it one direction is causing it.
Even if I do have only .005 wear on the throttle shaft bushing/surface it's still going to hang a plate .005, or 50 RPM right? :D