Interesting that the SUT option sounds better than the Active jfet. Sounds like VTL needs to go back to the drawing board and design a new active j-fet amplification step.
In using the SUT, do the mc loading values change?
yes, you can change the loading in using the SUT. only the output level cannot be changed.
regarding the active mc, depending on the cartridge it is also good. for the active mc i am using my sonic lab ultra eminent and for the SUT i am using zyx airy 3 gold.