RE: 9505 Duel Ele
I had the same problem with my DX8. There was a setting that activated the trim on the mixed control surface. On the DX8, that setting was in the mix settings. Not sure where you find it on a JR. The other option is to mechanically set both servo's linkages correctly and matched (i.e. where no trim is needed.). I typically go back and mechanically set the linkages so that no trim is needed,, once I maiden and get an idea where they need to be. That way you can use different transmitters w/o worrying about having to retim, etc.