Correct. Coefficient is the same as Monitor Distance Vertical, so 1 = 100%. And the ADS sens multiplier is the scale, so 0.75 = 75%. So by setting the calculator to match your configuration it will automatically calculate the correct sensitivity.
This is probably a bit confusing, but when you convert directly from the SMG ADS to R6 ADS you should set the scale to 100% instead of 75%. The reason for this is that the numbers you enter for SMG ADS (8.68, 1, 0.75) is already equal to 75%. So if you don't change the setup to 100% you apply 75% twice.
I'm looking into ways to make this work more streamlined, but that's how it is for now
Use MDV 0%, that makes the most sense in your case.