Just tested M1A2 in 2.5.2.19682 stable release version and I have serious bino issues which make this tank imposssible to use in a battle. I use 4K 3840x2160 resolution. For example in a T-90 it works without any issues.
I had exactly the same issue like you when I had GTX 780Ti. I found out that was because of higher core clock then default. When I set it to lower frequency just for few MHz less it was working without any problem.