I do agree with Tom that all aerobatic planes may do this to some degree. I am just wondering why the other similar planes that I fly with do it too a much lesser degree.

I think rcblimppro may be on to it. The biggest difference between the other planes I fly with and this WH Extra is wing loading. My plane comes in just under 17lbs with a DA50 (I need to check it again). With the 1365 sq in wing area - this puts the wing loading at about .2 oz/sq in. One of the other planes I fly with is an Extreme Flight Yak-54. It has a wing area of 1450 and weighs in at about 16lbs with .17 oz/sq in. It has very little tendency to role over on a hard pull.

Based on some crud measurements it seems that the EF Yak and the WH Extra have the exact same airfoil, from end to end. The Yak has about 85 sq in more area on the wing and weighs about a pound less then my Extra. I believe the higher the wing loading the more precise the setup needs to be.

I have done a fair amount of weight reduction to the plane - carbon fiber gear, took off the wheel pants, eliminated the redundant battery, regulator, switch and remove material in the canopy and firewall area. I have the light-weight aluminum wing tube, but could save a few more oz with carbon fiber. What else can I do to get weight out of it?

So, for now I will reduce the throws on the elevator, maybe put 1 or 2 clicks in on left rudder, and just fly it. I really do enjoy flying this plane. It is very capable of precise aerobatics and 3Ds very well. I'll just keep looking for ways to get more weight out of it.