Thanks for the comments so far, I appreciate all of them!
I'm confident in how I had the preamp stages set for the 200, tone stack controls at 12 o'clock, no voicing selected, no overdrive amount or gain, and input volume fully counter-clockwise. It's possible that the 200 I auditioned may have had an issue (Guitar Center, brand new amp).
As soon as I raised the master up to where the bass came through it was LOUD. There was a very small area of the control between fully CCW and 8 o'clock that I could get an intermediate volume, but it was REAL touchy. It did get louder past 9 o'clock but there's no way I was going to dime this in Guitar Center.
After a lot of years of having a crash cymbal off my right ear I don't play with loud drummers any longer. Once in a while I get involved with a pickup project where a drummer is involved, but all these guys now play nice percussion and there's usually not even a crash cymbal on their kits. My tinnitus can't take the abuse any longer.
I gave up actively playing a few years ago for various reasons but I still do an occasional bar gig doing Cajun/Zydeco, early country, or old time / Bluegrass / Americana stuff, but sans loud drummer. I used to play Tele mostly, but I've went to acoustic guitar, again due to the volume issues.
I'm still totally up in the air on any long-term decision, I currently use a Workingman's 12 for bass and that does fine volume-wise. The extreme light weight of the Rumble combos is a huge plus for me.
Keep those cards n' letters comin'...