hmmm, ckau, maybe video it and check it in slow mo if you can. crazy as it sounds. i'm wondering if it's the tall "hoop" bar on the right flexing inwards? That's the one that kept hitting on my frame, but i always have had the same chain slack issues you're describing. I know mine moved to the left from the hits, but i also wonder if that bar flexes over under torque? i've got the tensioner bolt gorilla-strength double nutted on both sides of the "plate" and still have that happen.
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