(had to ask-you never know ;-)
Just MC, but I am about to try the path your on, using a low output (.18-.2 mv) Allaerts MC 2 FInish. I suspect a outboard trannie may help. Although it sounds pretty good as it is.
(just some tube rush-it has helped me trace down all sorts of noise floor items. like moving the power supply from about 6 inches away to about 6 feet away, upgrading power cord, tweeking cable placement etc)
My dealer also has a request into Nagra to custom wind trannies with a bit more gain. I'd love to try this approach and I hope Nagra considers it-happy to pay a fee here. Maybe if a few of us contact em....
What output is your Kondo and what gain is the SUT?
(ps, hope someone gives u a better answer :)