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Last time I checked RA praised the Pro-Win as one of the best after market hopup units. I'd have to agree; I installed mine in a practically stock TM gearbox and it seems to be feeding excellently, so it shouldn't have any problems.
I'd check the nozzle and see if it's actually moving inside of the hopup unit, that might prevent it from feeding properly (although that'll be a bit hard to check when it's all attached) and possibly check the part where the two screws are locking the hopup unit down to the lower reciever and check if it's warped out of position.
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