Cause i'm such a nice guy
I just looked at my droop your way roughly
34mm rear 32mm front ish
but my settings are about .5 to 1mm out at the mo (new tyres)
So at a guess using your formula to do it i'd say 31mm font and 33/34 rear
but basicly measuring from the ground to the bottom of your car after setting your ride height i think you should have about 2mm of upward movement at the front and 3/4mm at the rear over and above your ride height to full shock movement.