Nevermind, just read your whole post. Time for some new blocks. I’d scrap that whole 3 circuit idea, I know some guys think they are great. You don’t need it in dual 4150’s.
I haven’t encountered a 3 circ 4150 yet, I see the main body has the bleeds though. Pretty strange, I’d love to have a better look at the set up just so I understand it better.