I think it was the exact issue you were running into. Adjusting all the other steps to specs went pretty smooth. But this VCF level thing is really a pita. The funny thing is, adjusting the LPF cutoff level interferes with the HPF cutoff level (adds up to 1V!) although I'm measuring on the HPF terminal itself. Needless to say that in the end I ended up with different sounding VCF levels on each note. Only slightly, but I'm trying something else now, as it didn't work out that good.
How about sharing your notes about the preset-modifications? :) Not that I'm going to install them, but I am curious about what people wanted to change. That LFO and Unison patch would be interesting to me.
Is that tab assembly only useful for the CS60?
Michael