The Midwest Industries mount has a very long moment of inertia. And. it mounts to a small plastic location. Two strategies folks have used that work are 1. use the smallest, lightest sight possible and 2. build a backing plate or otherwise reinforce the plastic forend at the mloc slots. Folks have built backing plates which spread the load and reduce the damage very tight mloc fitment does to the tiny grab locations where the mloc nuts cut into the plastic.That's upsetting to me as I just spent $100 on the mount - which is nuts for a mount. The majority of the commentary (written and video) I saw on the Midwest mount said it does maintain zero. So I'm totally with you when you say "I WANT this to work!" Not sure why zero-ing it in at 100 would or should be more effective than at 25 yds.
Also, there is a Texas Company called Performance Services which offers stabilizers that secure the forend to the barrel in additional locations.