I think I read about someone having the same problem, but I really cant find the thread.
I'm running 8611 on the elevators for the edge. Both linkages are set up identically, I've adjusted mid points to give a perpendicular servo arm. I've adjusted throws using end points to give identical up and down throws on both elevators.
But, there is a noticeable delay in one servo. I cant time it, but it is apparent.
I'm running one servo into one channel, and the other into another, so I know it is not an issue with a y lead.
Any thoughts?

Mike.