With due respect I don't think we are stupid enough to be missing the point Mick, just trying to help the guy out.

As I said, my Elan will do everything in the book with no problems, aerodynamics are influenced by a servo's ability to do the job, what appears to be ok on the ground is not the same thing as flying at 150 mph which exerts considerable loads on the elevator servo's, Mike is quite correct also re the loose boom syndrome.
All Elans come out of the same mould/jigs etc. My Elan is perfect so something else is causing the problem assuming the thing has been assembled correctly.