I doubt the engine has been balanced in the past as the balancer/pulley that came on it looked stock and not altered. Original cutout and holes, although I have no way to test this as I threw it away as soon as I pulled it off.
I can test tdc again on this balancer but I also used a new aftermarket dampner with the same symptoms.
I would hate to spend more money and more importantly effort/time buying and installing another tc, but how else would I test that theory aside from just removing it. Running out of options at this point.