Great review, Dan!
Your review does indeed seem extremely honest and to the point...one of the best reviews I have read on audiogon.
No sugar coating and straight-forward.
Wish all reviews were like this.
From your description, the modded JC-1's seem to sound more like the older Parasound HCA-3500, but without the brightness and grain.
The older 3500 indeed sounded more open and transparent,in the mids and highs,and seemed to have better treble extension extension than the JC-1's, but are alittle too bright for my own tastes.
This review makes me wanna consider the mods myself!
Best of luck with your amps. Enjoy.