grunter, yes, I'm looking for "more content, less smoke" too, especially as I use tube as well as SS amps.
From what you say the jk gear sounds very good.
I like MiniMax but found its bass washes out lower mids a little., e.g. harmonics of cello or piano. This shows up occasionally as lost detail. But higher up it has a clean, pure sound.
JK usually give you 20 days home trial period, so you could try it in your system.
For the price I think jkdac32 is a wonderful dac, it has deep and ariticulated bass, even if it could be tighter for my taste.