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what's happening here is not the nozzle not being able to fully reach the rubber, but not have enough power to fully push the BB in and mate the hop up rubber.
You mention changing the hop up unit helps, this pretty much nails it down.
the cylindrical space inside the hop up unit where the nozzle travels to push down the BB is where the problem is happening. The nozzle is rubbing strongly against the surface, and therefore slowing it down, and thus not being able to fully insert the BB into the hop up rubber(and mating the hop up rubber) before the spring shoots forward.
causes are usually:
-Tight travel space inside the hop up unit
-Hop up unit is inserted into the gearbox at an angle
-nozzle is generally too fat
If these are not the problem, the cause is strictly "too much resistance against the nozzle", so that should help you solve the problem.
so the first thing I'd try is sand down the nozzle a bit and make it thinner. Next is dremel the cylindrical space a little larger. Next is try to align the hop up unit to the gearbox properly.
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