Re: Is there a potted antiquity humbucker?
I have both Seths and Ants in Les Pauls. As others have posted, they will feedback, but in my experience it is always musical and controllable, and not the high-pitched squeal that is so irritating. I use Mesa Boogie amps in a Classic Rock and Blues cover band. I don't play with metal type gain--my lead tone ideal leans more towards Santana's singing sustain. And honestly, we're not super loud. So, it's not a pickup I would recommend for loud metal chugging.
You might want to think about the Pearly Gates set in your 335--this is a vintage-style PAF, and they come potted. The alnico 2 Gibson Burst Bucker #1 and #2 would also be a good choice. Aftermarket BBs are generally NOT potted, but factory installed pickups are. The BBs are a bit brighter and more articulate than the Gibson Classic '57, which are pretty darn good in 335s. And then you have the WLH set....lots of choices.
Bill