Recently I purchased a Kat 70 after retiring my well liked Kat 40. I've finally been able to get it together and out to the field. I really like the way this aircraft flys except for one problem. When I roll and come back to level flight it wants to continue rolling that same direction. It does this rolling left or right. Originally I thought maybe my year old 645MG's were not centering so installed a couple new Futaba 3305's on 6volts. My aftermarket linkage is top quality and has no slop. This rolling is only gradual and can be trimmed out but its back and forth with the trim. So, this really doesn't make for an enjoyable time. Any ideas? Thanks for the help.

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Kurt