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Maybe this applies to your situation, maybe it doesn't. I've seen a lot of used guns with replaced hopup sleeves were the little packer (looks like a ~3mm piece of copper wire insulation) wasn't put back in.
Since you installed the new hopup sleeve you probably remember if that was in or not; it usually fits inside the small port in the hop up unit where the "arm" presses down on the hopup membrane. Your new hopup sleeve may or may not have come with one (most do now).
Without it installed, you need to turn hopup almost all the way up before the tip of the arm even begins to push the hopup into the barrel, maybe your whole hopup setup virtually useless.
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