Same problem here. Reversers kick in at idle. If I don't have reversers in it seems to idle high. I also seem to have a hunch the N1 seems to be rev'ing / surging slightly but I think this is related. I've tried everything I can find.
Calibrate the TCA throttles .
The -0.05 "fix" that is mentioned on the A310.
Numerous calibration variations and attempts.
The in aircraft throttle calibration is, for me anyway, about the only real downside to this aircraft.
I have a Saitek throttle to fall back on but I can't get the reverse to work on that either! Anyone any pointers please.