VR3 in C4 mode, which setpoint?

Sorry, but I'm not sure I fully understand....(it's a language thing )
I can see that you use same settings on VR3 according to Inspirations setpoints. So far so good.
Could you in an other way explain the last bit. Which correction do you apply and is it during the dive? How do you know how you are going to correct? and so on...

In the real world, the CNS and OTU are not all that important to track to the last decimal point... They are highly inacurate.

When looking at my PO2, I rarely have above 1,3 during the bottom portion of the dive. It tends to be 1,2 - 1,3. So the average value of 1,25 is closer to what you are actually doing.
But even when doing deep'ish and long dives, the few minutes extra in deco time won't make the difference between perfectly fine - or a serious bend.
It's a contributing factor, but 4-5 minutes out of 60-90 minutes obligations amounts to very little.