To avoid any misundersteanding the SBR/time values I gave for both the 2;2:100 and 1:1:100 dilution of Procat-HD were based on UV readings, not blue channel. That is because I am testing for kallitype and palladium printing which are sensitive primarily to UV light.

In general I would need to substract about log 0.30 from my UV reading to approximate the blue reading. So in effect if your readings are giving you a density range of 1.6 with the blue channel reading this would be an effective DR of 1.9 or more for me with a UV reading. Did you check the results with your X-Rite 361 in UV mode?