Ok, tonight's rehearsal report.
Weird.
I converted my bass back to passive, and everything sounded much better. Clearer. Punchier. This was with the cab and combo stacked. But, I was fighting too much low end all night. And remember this is in a very problematic room.
So I disconnected the combo, and it was - as expected - thin, but not as much so as I thought it would be. Then I put it on the floor behind me. Bingo. Damn, that little thing sounds good! Deep, punchy and growly. And again, in the awful room. Later, I hooked up the 210 cab sitting beside the combo. Back to too much bass.
So the jury's still out for me, but for certain, the combo alone is killer. Not convinced the 210 adds anything except for a lot of low end, which in my case is mud. I'm sort of thinking the 15 might be a better match, but i don't have experience with the Rumble 15 cab; 15's usually add midrange, which would be welcomed in this situation.
But I've got a gig on Sunday, which should tell the tale. Stay tuned...