Hi
I read all thread and I though that all resistors was necesary.
I use this GRLV with my Dynalo SS. I didn´t any adjust (I matched all resistors, leds and I adjusted trimpots on 50K before plug in). With the Dynalo SS connected to this, I can measure; -19,993 volt and +20.000 volt and between rails 40,00volt exact. With no load, same measures.... I hadn´t noises or issues.
I´m using a r-core with 25Vac@1Amp x2