So I have played with it quite a bit more....and I liked some tones I got at a session yesterday for a few songs. Definitely got further along than before after trying it at 12v (definitely opens it up a bit), and having a much better understanding of the EQ (as well as reading a bunch of stuff on the signal path, etc. of the FMV tone stack). Really did have some nice stuff going on.
So I got back home to try out what I arrived at after dialing it in yesterday with IEMs on stage (and also tried the whole mid cranked thing as suggested).....tried it on a couple of different basses, and was pretty happy with it - enough to keep it on the board for this coming weekend and keep trying it out. Then I just plugged in my Saturn in its place to A/B it (which I'd never tried at 12v before). Holy cow. It immediately just blew me away. I don't think I can take it back off the board now. I feel like everything I was trying to do with the Redstone was really me trying to get it to sound more like the Saturn.
I know some people said they could get the Saturn tone out of the Redstone (and also the Grizzly....which I think sounds a lot more like the Saturn than the Redstone)....and I can get it sort of in the ballpark, but it just never has that same type of clarity and openness to me that the Saturn has. And running the Saturn at 12v sealed it for me. I also think I just really like the character of my basses, and every time I play through something that has any inherent mid-thing going on (and you can't really take that out of an FMV tone stack), I keep trying to undo it. That's why I started only using preamps with James/Baxandall tone stacks - you can't really make them sound bad, and you can still do a lot of shaping with them without changing what your bass sounds like.
Anyway (sorry, got sidetracked), I made serious strides with the Redstone.....and it only made me realize how much I love my Saturn. So as impressive as it is, the Redstone is going to be leaving....and as much as I love my Saturn, I'll probably still be foolish enough to jump on the next thing that gets released - thinking it can somehow replace it.