As noted above, elevator sensitivity can be caused by several things, Some are detremental to the aircraft survival (CG to far rearward comes to mind right away and should be corrected before flying again). The other can simply be to much throw. You can leave the throw the way it is and simply dial in some exponential. That will soften the throw for the first part of the elevator action but make it more severe as you move the sticks more to the end-stops.

If you are not going to fly very agressively, though, it may be better to simply remove some of the throw by changing the position of the clevis's on both ends. On the servo, move them closer to the center of the servo arm. On the elevator, move the clevis further away from the elevator.

There are always give and take issues with this, no matter what you try. The best of all situations is to have the most movement of the servo arm cause a movement of the elevator surface. This gives you the best resolution or precision. But there is always a give and take with THAT situation. It's never easy, as you can see, you have a lot to consider. But I would opt to moving the clevis out further from the elevator for a mechanical adjustment, which gives you less movement of the surface with the same servo arm travel.

Then again, there is always end point adjustments on a computer radio (as is Exponential, by the way) but is sort of the last resort. You lose resolution when you play with end points.

As you can see, you should to try to get the most advantage out of the mechanical adjustments before playing with computer inputs on the transmitter. (that goes for all surfaces.. aileron, rudder, and for throttle throw).

Hope this helps.

DS.