I have experienced the same problem. I solved it by:
- Using unbalanced cables
- Using unbalanced inputs 3/4 on my RME Babyface Pro, with a -10 dBV reference level
Now the master volume can be kept between 0 and +2 dB and is plenty loud. The rest is being handled by the various means of gain staging each preset.
The only thing now is that the factory presets are all relatively quiet, at least compared to presets of my own design. I am finding that I need to boost the VCA to +4 dB to get good levels for playing purposes, with a final adjustment on the master volume. I am not sure if this is the right approach, but it works for me so far.