@taylorro what are you missing with the JC-1s that you believe could be better solved for you with the Pass X260.8s or PS Audio BHK amps?
I did own one of the smaller plus+ amps from Parasound for a while, but not the original JC-1s. PTA reviewer Dave M and a few others have commented looking for more of this - "slightly bloomier low end along with a smidgen of extra juice to the mids".
And you, what do you want more/less of, if you can describe it? Thx.