Good Point. I have about 125 hours on the amplifier so not completely broken in yet Accuphase recommend 200-300 hours. I should wait until then.
I don’t have any specific improvement. However in other cases with source components I did experience improved soundstage particularly in depth and instrument placement as well as additional refinement of the lower treble. So I’ve been surprised so far not to be able to experience similar improvements replacing the amplifier stock cable. It may be that Accuphase has provided the best match.