Film tested as 80. Fell short of ASA parameters.
I have the meter set at EI 100.
Sun was late afternoon, fairly low in the sky following a storm (clear skies with minimal dust scattering).
But I just checked and the meter still reads same f/16 at 1/250. BUT, it's in spotmeter mode.
So I must have spotmetered the 18% background of the test chart and not made compensation!
If 3.6% isn't black enough for a flare test, I guess I will have to get the top-hat out for the next test...