Worth it to try a SUT with a 103R and Herron VTPH-2?

So I assume your Herron already provides sufficient gain for the 103R.  Yet you're thinking about interposing a SUT between the two, presumably using the MM section of your Herron.  My bias is that this would be a step in the wrong direction, but neither I nor anyone else can predict what YOU will like best.  Also, your choice of SUT would have everything to do with the outcome.  

There's a review by one of the Stereophile writers (Dudley) comparing Bob's Devices 1131 SUT to FET amplifiers and the preference was for the transformer.

Now that's something I haven't thought of (he said, shooting an email to Keith Herron!)