Question on pulley bolted to dampner loosening up

You likely have a vibration problem. I would get a different brand/style of dampner.
Similar story: engine kept cracking crank pulleys. All sorts of stupid suggestions made to remedy the problem. I told the owner he had a vibration problem.
The problem was 'fixed' sort of.....when the crank broke behind #1 main.
The engine was brought to me to rebuild. The dampner was one of those types that was multi-piece bolted together with Allen bolts. Most of the bolts were loose & this is what caused the problems.