I use a chart Stephen provided that gives Contrast Index to develop to... for the paper grade and subject luminance range.
I start out with 7 stops == N.
The chart has Flare compensation built-in.
And I use the EI based on my speed tests that are basically to the ASA/ISO triangle but I feel are not quite box speed.
I meter using Zone System notation (spot shadow, place on Zone II, or spot skin place on Zone VI etc.)