I feel like such a silly bunt. Why didn't I think of that before.
Anyone care to do the math for me?
Took everything out of the well. Set flashmeter to ISO 100 and aimed right down the middle at the film plane. Time 1/30th.
10^-2 = f/16.0
10^-3 = f/45.0
10^-4 = f/5.6.1
Note: When I moved flashmeter to the left and right sides of the well at 10^-2 it read f/15.9