I don't believe elevator throw is involved in your "jumpy" takeoffs - it sounds like a technique issue. Try using a little elevator as the airplane picks up speed to get the airplane up on just the main gear. Hold it there. As the airplane picks up airspeed it will naturally glide off the runway in a nice shallow climb. It does take practice and finesse to get it just right. Few model pilots do this, but it really cleans up the look of your departures.

Have fun!