I know this reply is much later, BUT...
I just wanted to let everyone know, that I did have shielding paint in the pickup cavities of this guitar, until I sanded the cavities, tonight. I did it to see how it would affect the tone.
I still have the painkillers in that guitar, and I can honestly say that removing the shielding paint drastically improved my tone. My pickups seem less "Boxy" and the pickup just screams with top end. Harmonics are so much easier for me to hit, as well.
Finally after 2 years, I can hear what these bad boys can really do, and it is inspiring all over again! I just wanted to let everyone know.
Cheers!