To close out this thread.....
So after a few drive cycles, my ABS, TRAC, VSC lights went off. No idea. I ultimately didn't replace anything. I did wiggle some wires, and re-seat connections, but honestly don't think that was it, since it didn't solve it the first time I tried that.
It sounds crazy, but the only thing that perfectly coincided with it improving was the weather. I know I've read in some other threads about cold temps, so I guess it's possible?? Could there really be something in the ABS module that just doesn't cooperate with temps below 30 degrees?? Seems like a major achilles heel to me, but I don't know what else it could be. Thanks again, hopefully it's resolved (at least until another week of freezing temps)