Again ... thanks for this. I've kinda reached the same conclusion.
To be honest - this is quite specific to smaller gigs/venues where the live sound of the band is more 'augmented' by the PA rather than completely controlled. Fairly minimal monitoring and it usually vocals and any acoustic instruments. Indeed we may be running the FOH mix from stage (iPad etc). So typically i would get a vol lift onstage for solos but the FOH would remain the same level. So the audience perceive a vol lift but not excessive. I also have a couple of patches ( helix) where i run harmonies into FOH at a lower level. A kinda of WDW but using FOH as the wet.
Like i say, small venues only. I have no issue on larger stages. It's just one of those things that helix does with ease but seemingly not poss with kemper. Not a huge problem and i'm certainly liking the kemper sound and feel, so the trade off may be worth it.