Just curious but did you try a lower air pressure?Mine only goes above 10 psi if I'm doing a large area. Also try connecting ground directly to the part and check for difference.When grabbing the part you won't feel a charge however don't touch the electrode at the tip of the gun or it will wake you up rather rudely!! For a groung test after spraying a min stop spraying and touch tip of electrode to the hook and see how big an arc it draws discharging the transformer, it will be a short quick spark but you should be able to hear the crack if it is grounded well.Don't keep it touching just bump it and get it off. Or you can grab a digital volt meter and check for resistance and continuity between the part and a known ground.
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