F-Stop printing is as simple as using the sequence 5 - 10 - 20 - 40 seconds (doubling each step) instead of 5 - 10 - 15 - 20 for your test strips. (I personally use 13 - 16 - 20 - 25 - 32 seconds because it gives me "third-stops"). Unless your times are under 10 seconds you probably won't need fractional second precision.
Originally Posted by nextreme
The minimum-time-to-maximum-black is associated with another "Fred Picker" philosophy, where he would consistently expose negatives to a precise minimum necessary exposure (to look good at that point). In reality your best test strip selections may not relate closely to that black strip printed from the clear leader. Of course if that strip is dingy gray when the rest of the print looks realistic, it might mean you should increase the paper contrast.