Is SUT needed for a low output cartridge with a Gryphon Pandora & Legato phono module?

I recently upgraded my cartridge from a high output Sumiko Blue Point Special EVO III to a low output Dynavector DV-20X2L cartridge. I changed the impedance settings on the Gryphon Legato phono module from 47k to 80 ohms and the results are very good. The Dynavector cartridge is noticeably better than the Sumiko. . Some have suggested that a step-up transformer may produce even better SQ results. 

I'm hoping that someone with a Gryphon Pandora preamp with the Legato phono module may have already experienced using a low output MC cartridge and can chime in whether a step-up transformer improves the SQ.