Roadracer,
Had a thought while browsing. (I have WAY too much time on my hands!)
Being that you have two servos on two different chanels for elevator, would you want to try giving the right half a little more travel volume?
I know. That can cause a host of probs. But what could it really hurt to give it a try?

Would a gyro help in this case? I don't have any experience with'em and they do have a wide variety of applications.

Jeff