Hey Mark,
have u figured it out yet.??
I am running the exact same setup u got and had similar issues, i traced mine back to the antenna Hitting the back tail wheel make sure u tape the antenna under the fuse away from the tail gear as the is Composite A conductor
2x check your dpsi switch and make sure ur Output current is no larger than 6v if its more than that this will cause glitches
3x ignitiong module Must be Well away from the reciever i will leave a picture of my interior setup hope this helps
if none of this works tr plugging in another servo in that chanel
see what happendes Could also be a faulty servo
where bouts in aus r u.? im in syd...