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The chain sure sounds reasonable.
As to PCV, that extra power probably comes from the elimination of air pumping losses (crank, backs of pistons), according to the ring explanation the vacuum should just suck all the power right past the ring gaps, right?
Excessive vacuum is not healthy for a motor, and not only allows strange air leaks, but can also do things like fold seals over, suck gaskets in, and effectively make an air reservoir that the MAF can't see. The PCV doesn't just vacuum the crankcase, it replaces the fumes, while quite intentionally avoiding excessive vacuum by orifice and valve sizing, type, placement, etc.
It's a problem that some stock cars develop on their own, and instead of getting super fast, they develop leaking, oil burning, and drivibility problems, and get taken to the shop.
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