Cool, I have those pickups in my Studio Doublecut. Congrats!
Hmm, I haven't heard this and it sounds sketchy. There are, however, lots of Chinese-made fake Gibsons floating around. If you bought new at a dealer, there should be no prob.
I'm a big P-90 fan, up to 5 now:
3 solidbodies:
a singlecut w/a single GFS HB-sized bridge P-90
a singlecut w/2 Gibson P-90s
a doublecut w/2 Seymour Duncans
1 purely hollowbody with a dogear Epi and a dogear Rio Grande
1 chambered solidbody w/2 dogear Epi P-90s
Definitely try one out, but be careful, they're addictive!