Digital BW, The Print

I'm really impressed (and getting more impressed by the day) with 
IJC/OPM - thanks to Joe and Richard for their help and also for the 
new tutorial.

One question though; When I print the target for linearisation my 
densitometer reads step 26 darker than step 25 but to the eye there 
is no difference whatsoever. If I linearise using the readings am I 
in effect wasting shadow detail by having step 25 and 26 identical to 
the eye even though step 26 is "densitometer darker"? Would I be 
better tweaking the inks or the sliders to get a visible difference 
between 25 and 26 before completing the profile?

Thanks in advance.