I'm a fellow lover/owner of Acoustic Zen and Line Magnetic gear.
Out of curiosity, I've been considering the Puritan PSM156, but I'm not sure if it will constrain my 300W amp. Have you had success plugging your Pass Labs amp into the Puritan?
Also - very curious to hear if you found any great power cable upgrades for connecting the PSM156 to the wall. The Puritan Ultimate cable seems like the logical first step, but curious to learn from your experience. Happy listening!