first off, if you are using a 67 balancer on a 69 setup, then yes you are correct in that the pulley setup must all be from a 67 or earlier. the 67 timing mark is on the hub, not the balancer weight so unless the hub loosened enough so it could move off the woodruff key, it can only be in one position. And yes, the early weights also had a rubber that could fail, it would only result in an unbalanced engine, with a lot of vibration but the timing did not change. now you could switch to the larger one piece but all the pulleys would have to be changed. If you looked at the crank, the keyway is good, the hub doesn't move on the keyway, and the rubber is intact on the weight then you are good to go. look for timing chain slip or something else.
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