You are using these on bass Dave?
I'm using these with my Alembic Series II bass, yes. Of course, the music I play isn't really "bass".
While most of the modeling in Fractal products is focused on guitar amps and cabs, there are some models of bass amps and cabs. And while most users appear to be guitar players, there are some bass players (and violin players, etc).
I don't use the bass amps or cabs. I either use various guitar amps and cabs or acoustic IRs. And while most guitar players use modeling to recreate the sound of real amps and cabs, I don't. I use the amps and cabs as starting points to create my own sounds.
I recently purchased some studio monitors, and as a result I am going back through my settings and making significant changes to how my songs are setup. I'm also finally beginning to get a basic understanding of how to use compression in the signal chain, which is having a significant effect as well.
The weakest link in the chain is the guy holding the bass, but I keep working on improving that part too.