At some point Potter may have switched from balsa core to plywood in the deck, which would have added weight, but probably not on a mid-70's boat. He was becoming progressively more pinched for cash towards the late 70's, going bankrupt in '79 or '80, so I suspect he was looking to cut costs by then. I know the later Sceptres built by SeaCraft Industries had plywood in the decks and front bunks which made them a bit bow heavy. I agree moving the gas tank and console fwd would improve balance with the modern heavy motors.
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