@tvad
Note the OP is using Tektron Electron SE loudspeakers, which are rated at 98.82dB/4ohms, so they seem to be in line with the high efficiency Tannoy and Klipsch loudspeakers on which you believe Pass Labs sound best.
I like PASS a lot, only with certain speakers and preamps.
Some of the better sounding setups I’ve heard with various Pass amps and Pass preamps was with lower 87-93db sensitivity, 6-8ohm speaker’s. A little more laid back, more musical - a much better match having sensitive hearing coming from SS to all tube now.
A few years ago spent a few hours on/off listening to some of the new Pass (.8) series amps during an audio show, paired up with very-well-known highly efficient 98db speakers. Being blunt, that room was by far one of the worst and least musical sounding systems in the entire show, IMO. Super fatiguing. Felt bad for the Nelson Pass’ life-size cardboard cutouts on display. No, it was not Nelson’s room. Someone else’s.
Recently sold two pairs of Cardas Gold Cross interconnects (extremely veiled over, rich) from my own solid state amps. Great match for some SS amps. Some PASS owners love them. Sold! The buyer needed them to take " a lot of the edge off " his new Pass amps with HIS particular speakers. Read up on Pass XP-10 vs. XP-20 preamps, and those commonly using really good TUBE preamps, combined with older Cardas - "Golden", "Cross" series IC cables to help SMOOTH things out, take the edge off in these same type of situations.
Speaker matching with Pass amps is key. Preamps matter too!