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do you have the lower body pin inserted while testing? if there is any misalignment in mech box to hop up the nozzle will not move freely enough to seal against the rubber before the piston is released. also you said it is a two piece hopup. check the lower feeder to make sure it is securely screwed down and not shifted either up or down or tweak side to side ( ie: one screw tighter then the other. although you said when you changed the upper hopup piece it solved the issue). Another test is to take the original hopup upper you were using and switch out the six inch barrel with your longer tbb WITH the old rubber, insert test if it shoots high then its a upper hopup issue if it shoots consistant id start looking at that six inch barrel. as well when you pulled the barrel and rubber were you careful about reinserting the hopup nub, if it went in side ways it could be putting to much pressure.
just some more ideas for you,
Cheers, Jesse
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