Hey folks, Rare poster here, but recently acquired two new Gretsch' after joining an alt- country/Americana artist and am greatly enjoying both instruments (2011 6128T Powerjet Firebird and 2018 5622T Centerblock). While I love both instruments, both suffer extreme high end roll off with the master volumes (and individual volume roll offs) rendering them virtually useless. After researching here, I ordered the treble bleed cap recommended on the TV Jones site and installed that on the Powerjet's master volume. There is no appreciable difference after this mod. My question(s) would be ....do I need to put a cap on each volume pot to make it more effective? Are the pots themselves a potential issue (CTS500K)? Any info/insights would be appreciated.