[sparkycuda]

Nathan & Neil, thanks for the suggestions. I'll try both the chokes and capacitors. The motor is an Integy V11 and is supposed to already have the capacitors but it's worth a try. Relocated the steering servo last night and it seemed to make a small change. The servo does not pull to the left when the motor runs above 1/3, it just won't return to center when you quit steering. Kill the motor, steering re-centers and away you go. Or, if I just creep along at slow speed, steering works properly. And I thought the electronics was going to be the easy part! I'll keep trying.
Thanks to everyone for the help!

Ken