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you still have your old piston head? try putting that o-ring on your new pistonhead.
You could also be losing some air on the new cylinderhead seals.. try wrapping some teflon tape around the cylinderhead to seal it better.
you might need to massage the hopup rubber around inside the hopup unit... sometimes it's not sitting perfectly round or far back enough, which is probably why when you switched back to original it seemed to seal better.
Also try blowing into your hopup while plugging the holes and barrel, you might have a leak between the unit, rubber and barrel. a bit of teflon tape around the end of the rubber towards the front can help seal it.
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