Maybe you could try some expo on the elevator and see if that helps .Its not hard to over control . Does this happen at other sites or only at home? Is it always in the same spot going in the same direction and is the wind always going in the same direction ? Have you ever asked another pilot to fly your plane too see if it happens to him too ? More information about your plane , the site you fly at , if you fly at other sites , would help us to help you .