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Tappet plate is a good place to start, but since it hasn't been mentioned.
Barrel length vs Cylinder type is an issue where unported cylinder heads are concerned, the suction action of the compression assembly can rapidly reduce the pressure in the barrel leading to a moment of suction and extreme turbulence while the BB is traveling down the barrel.
Ensure your using a ported cylinder head and that the ports are unobstructed by grease, check the oring on your cylinder head and ensure that it has room to move forward and back allowing clearance for air flow... if its swollen and cant move it cant function properly.
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