Ended up buying the Modwright LS100. It is a superb preamp - very neutral, added a slight bit of heft to the bottom end and a bit of air to the top. No change to tonality whatsoever. Bass has improved quite a bit. Now when I go back to DAC direct, I feel the heft is missing.
On the negative side - it is pure Class A and has no feedback. So any noise in 6SN7 tubes that it uses gets thrown on your face. I tried a bunch of nos sylvanias loaned to me and they all sounded noisy.