I managed to get very good tuning both to my ears and thanks to a Mac OS chromatic tuner.
On another try tonight, I again max out VR10 on Voices 5 and 6 when tuning C2 without getting to the proper pitch after tuning all of them at C6 properly. It seems for some reason these two voices are too low, especially Voice 5.
Since the manual mentions VR3 as global for this section of the tuning process, I had the idea of reference tuning the C2 with the voice giving me the biggest problem when maxing out VR10. Therefore, I tweaked VR3 clockwise until Voice 5 gave me the proper reading according to the chromatic tuner. Then, I tuned Voice 6 with VR10 - for once I had to bring it down a little.
I re-tuned the rest of the voices using C2 and the chromatic tuner back down with VR10.
I didn't check voltages but to my ears, when playing chords, string sounds and pads sound really, really good finally!
Thanks guys.
Yash