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The nozzle is leaking replace it with a double o-ring one and shim your hop-up barrel unit with o-rings instead of the spring if that's the original device.
When you hold the hop-up into the gearbox the fps goes up cuz the escaped air is being funneled down the barrel but when it's fully assembled the hop-up isn't seated fully against the gearbox.
Your gearbox isn't being pressed into the hopup unit hard enough in this case. Nozzle misalignment is indicative of misfeeding and low fps but since it's not misfeeding I have doubts.
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