I feel you. I had a similar revelation today, but it involved pretty much my entire rig. One day, I will actually pare down my rig and start practicing, instead of noodling and tweaking knobs to find "the tone".
Yeah, I need to get more Rats... The Iron Pig is really ticking all the boxes right now. In the past, I had a few other Rats (Blower Box, Volt Thrower, and a tiny clone), but they never stuck. The Blower Box was too grainy in the treble (but the bass response was fantastic), I always felt like I was fighting the Volt Thrower but couldn't quite get there (but it WAS amazing!), and the mini clone was solid, but certainly better on guitar and I had other tone goals for that.
Anyway, after spending time with the Iron Pig, I think I'm going to have to try a Rat Tail with clean blend. It's more than I'd prefer to spend new, but hopefully I can find one used. And after listening to all sorts of demos lately, I think the Ibanez PD7 will cover the Rat ground that the Blower Box would cover, but better (i.e. less grainy treble). The Rat Tail seems like it could smooth out better.
I also played my "other" basses today when messing around with various dirt, just to see how they sounded with all of my tweaking of late. Gotta say, the Iron Pig sounds totally different with flats vs. rounds! Most of my other dirt sounds different of course, but still very similar. The Iron Pig goes from fairly doomy to fairly thrashy just by changing the bass. It felt nice to play some of my other basses, especially my first (Ibanez Soundgear 300DX). In many ways, it was like coming home, and each one had a different tone profile, but each still sounded amazing.
I guess what I'm saying is this: I need more Rats in my life, and I love my gear. Life is good - regardless of Snowpocalypse.