I mounted new Mickey Thompson MTZ P3 tires on new trail ready wheels without a spacer. The ring is seated against the wheel and appears to be flat. Your post has me interested in taking a closer look at my wheels.
The bolts are not the issue as other wheel manufacturers us the exact same 5/16 grade 8 coarse thread bolts. I run Trail Ready beadlock wheels now and also 10 years ago on a rig running 40’s. I’ve beaten on both sets and have never had a bolt break.
The shim should solve this problem...