I asked around about my negative issue (see the previous post), and got some good pointers at APUG. I tried them out and here's what happened. Oh, and each image here also includes a little bit of fully-exposed film tongue to check density with.

D-76 Tank #1 - Single-reel tank, partial roll D-76 1:1, 11 minutes total Agitate 30 sec, then 5 sec every 30 sec thereafter This is my "control" tank, just to check how D76 does with this film/camera combo Density looks good

Rodinal Tank #2 - Double-reel tank, partial roll Rodinal 1:100, 60 minutes total 5 minute presoak in water Agitate 4 times per minute first 3 minutes, then one inversion at the 30 minute mark Density looks much better than it did the other day! Hooray!

Pyrocat-HD Tank #3 - Double-reel tank, partial roll Pyrocat-HD 1:1:200, 60 minutes total 5 minute presoak in water Agitate 4 times per minute first 3 minutes, then one inversion at the 30 minute mark What the?!? What happened here? There's hardly any frame number, but the "tongue test" shows good density. It gets even weirder...here's a section of several frames: Pyrocat-HD frames There's that one dark frame in there. But look closely..the clouds aren't darker. So it's only a part of the frame that got a lot of density. Weird. Must go back and ask folks about this.