Not Ranked
I know it sounds simple ,but have you checked the Bolt holding the damper on to the crank along with the 4 bolts of the crankshaft pulley. I have seen cases where the shank of the pulley bolts bottom out just as the bolt starts to clamp the pulley due to different material thickness etc, and gives the impression that all is well, but the pulley can move slightly under load.
Jac Mac
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