I think I have learned something from all of this.
I have a handful of sufficiently similar work basses.
According to the O-Scope, I have achieved a reasonable group-unity-gain across all of them.
They (basses,pups,pres) give me the sound I want (coming straight out of the bass).
(so not a problem with the instruments)
The amps that I use handle the instruments nicely, and have flexibility left in the preamp sections.
There is no Turdstorm emanating from my rigs. (so not a problem with the amps) And my rigs are Extremely simple.
However, while experimenting with certain non-compressor effects, the Bag O' Wet Farts "rears" its ugly head.
so...
+ I appreciate the value that a good compressor can offer. And I love the good ones.
+ I think a lot of effects sound great on a LesPaul or Strat, etc but are just hot trash on bass.
+ I can plug into GK, Ashdown, Old Trace Elliot, SVT, they sound like they are made for high-gain instruments.
+ Plugging into many 'other' amps sounds like a Germanium Fuzz Box.
So simply turning down the volume knob is not the answer for me. I don't want to alter the part that is not broken to accommodate for the part that is broken. And I don't want to infuse my rig with any more complication. I don't want to fix gear with more gear. My Spector plays very well with the SVT, for example. I'd go so far as to say that it sounds, what I will call, "good".
I thank you all for all of the great recommendations. But what I have learned is that...
...there's a lot of junk out there.