I don't have a 9C, but an 8U. There are 2 different mixes you have to run best I can recall. You have to have the FLPRON turned on to get the ailerons and flaps mixed. That's why you only had one working. Then you have to run the 2>6 Mix to get the elevator and flaps mixed. I use PMIX-1 on the 8U, ELE>FLP

Also, if you get it all mixed properly, it might still work wrong. Things like the Flap Ch 6 reversed will make both ailerons go up at the same time. Having the wrong aileron on the wrong channel (Right aileron HAS to be Ch 1) will screw you up. Having the aileron ch 1 reversed will screw you up. ATV's will screw you up.