@Nicholas,
Beginner has to ask beginner questions, as I just have my densitometer and still testing my BTZS charts.
Minor question - is the bottom (horizontal) scale reflect a tablet scale.
More important, I do not get your assertion. The curves reflected the paper characteristics. Is there instead we shall look at a diagram of curves say using all 00 and 5. For the 00, it should then compare, say 30s, 1m, 2m, 4m, 8m and so is 5 (which I assume you need to double the time of exposure but still developed for 30s, 1m, 2m, 4m and 8m.
Best regards.
Dennis