RE: setting up expo on a warbird ?
LDM it also depends how much movement you like the sticks to move in order for the plane to respond. Me personally I like you never use Expo and that is because anything more than about 1/2 inch movement in the sticks is a sloppy feel to me. I need to have a good solid response from the plane at 1/4 inch stick movement. The only time full stick travel is ok is in a roll or loop. The feeling of moving the sticks to the half way point to get solid movement does not sit well with me.
I think you may have too much surface deflection for your stick movement. It could be you are one of those that rather the feel of moving the sticks close to half travel to get a response from the plane. Expo will help you there, but have someone by your side on test flight to flip that switch in case things get too slow.