1. Have you made that ophthalmologist appointment?
2. Have you determined that you are not cross dominant (i.e., where your dominant eye is not your normal shooting eye). Try looking through your "non-normal" eye and see if the picture improves.
3. Mirage, when present, is going to be an issue no matter what...but it is not always present and that's when you can get value from the extra magnification. You can't dial up to a magnification you don't have in the scope.
4. Skketter, I believe, knows, that LynnJr uses the MOAB. Lynn has figured out how to make it work just fine with his .50 BMG. That noted, you do NOT need a ton of elevation in your scope. If you are into MOA, consider the MOAB base. If you are into Mils, consider the new micrometer Ivey setup - Iveyshooting.com
My take is that having a competent professional evaluate your eyes is #1 on the priority list.