OK, I missed the part about it skipping only on the small ring. That might be torque (chain tension) related, or it could be good evidence that the sprockets are OK (which is why I always suggest saving old parts replaced because of suspected wear).
The upper pulley for each sprocket is different depending on the chainring. I'd reconfirm hanger alignment, and bring the B screw in to push the RD down about 5mm and see if anything changes.
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FB
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