I did try using a more diluted (15/485 + 25 ml A & B) developer, and tried this on my Rollei 331 paper (which should be rebranded Fomatone MG 331) and saw some more action than with my other papers. However, using this dilution, it took 16 minutes for the image to appear at all and after 29 minutes I felt I'd had enough. I added some more developer and tried again, and the times were much shorter.

I started seeing pink-ish highlights and warm shadows, and a lot more grain. I'll try toning it in selenium soon.