High torque starter bind issue

I put this out there before and thought it was the starter it's self so i replaced it and the first 5-6 starts seemed fine. Now it does it more than not. I have a big block 400-470 11:1 cr, thats why the h tq starter. I am using a ford type relay made for h tq starters. Getting 10-11 volts out of relay. Sometimes the bendix does not line up with flywheel and binds against it until I release the key then it jams in. I know fords sometimes nedd shims, I read mopars do not. What about slotting the top hole just a little and tip starter outward giving more cllearance. Any thoughts app. Its a 5 spd also. thanks