with respect to your upgrade idea, you could try the modify one again and try two things:
1) Push it harder against your mechbox. If it helps, put teflon tape or o-rings around the spot where your barrel meets the hopup unit. Anything squishy that can push your hopup back a little bit against the mechbox.
2) Wrap the bucking with dental floss (search "maekiii dental floss mod" on youtube) OR wrap the barrel with some teflon tape and then put the bucking around that to ensure the seal.
Both of those things may help bring your Modify hopup unit back in business. It is really quite a nice hopup, so it's worth trying to get working.
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"Mah check"
Now you know
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