Looking at prints that I've made on this paper...
You list all the things I love about this paper, Tim. If you like those deep and what I perceive as unnatural blacks, you're not going to get them with any matte surface paper. If that is what a reader of this thread is looking for, save your money and go for the gloss version which is a very nice paper as well.
... it was either not warm enough in the highlights, or (at 60s) it turned too much like Wisconsin cheddar in the highlights, borderline orange.
This may be due to the strong bleaching out of any information you had in the highlights to begin with. The file you use as an example looks a little hot to me as if the highlights have bleached out. It could just be my monitor though.
As for the bleach time Thomas, it varies depending upon the feel and color I am looking for. However as I said before, what I have noticed is that the first bleach bath doesn't do as much as subsequent ones. I also use the bleach in a warmed state by floating the bleach tray in a larger one with warm water. To use your words...
"Experiment, experiment, experiment" !!
Also... I recommend following directions and using a very dilute hardening bath after your final tone and rinse and before your final wash. Depending upon your individual handling and washing, you might just open your print box in a couple of years and notice you have no image left.