I'm grateful to all of you for your constructive comments. Good points about each of the contact points, and it's also helpful confirmation that it's difficult to try to ride into fitness, and that some supplementary routines are helpful. I'll keep working at all the above.
I almost bought a TRK saddle before I pulled the trigger on my SQlab one. I was truly on the fence...and I found the SQlab on an Amazon warehouse deal for $27. It said it had a slight blemish somewhere on it (I don't remember), but I couldn't find it. It was in a width that was right in the range of what generally feels comfortable to me so I jumped on it. And it HAS been a pretty comfortable saddle for me overall. Perhaps I've let the adjustment get away from me and I need to play with different tilt angles. I understand small changes here can make large ergonomic differences.