Walt,
You just gave me a great idea that might help me narrow this down. Maybe I dont need 4 servos for the elevators especially with giant ballancers. But if I do go with them at least I can try disconnectin a couple to see what happens. Maybe that will help to isolate where the problem is.
This plane can be seen here.
http://www.aeroprotect.com/Workbench/Yak54/Index.html Maybe you could take a look to verify that I dont need so many servos.
Thanks
Darren