Well, if you have an old version of FSUIPC, from before the day when you should paid for it...
Open the Modules/FSUIPC menu, then on the popup window, inside the "Technical" page, there will be a frame, named "FS2002 only" and there is a parameter called "Fix control acceleration". If you enable this feature, you can adjust your settings by degrees increments.
Unfortunately the ATR panel have some gauges, that moved in front this hidden bug of FS.
Good luck.