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By covering the cavity & plastic cover with copper tape from StewMac:
http://www.stewmac.com/shop/Electronics,_pickups/Supplies:_Shielding/Conductive_Copper_Tape.html?actn=100101&xst=2&xsr=i-3789
...

I shielded the cavity and now the hum is gone :)

Also my other quieter guitars have shielded cavity, could that be a problem?

BTW Shawn do you know anything w.r.t. my question about lefty tremolo arm?

Hi Shawn,
The tremolo solder joint feels pretty solid. I also tried shorting the bridge block to volume pot with a wire but that didn't help. :(

Hi guys,

New PRS owner and first post here :)

My lefty custom 24 is having the same issue, hum/buzz at high gain/volume but goes away when I touch the bridge or strings. Tried 2 other guitars...