I'd re-do the estimated EG&G light output based on your tests. With all the estimated densities in your calculation of ISO 200/250 it could easily be 1/2 stop off. That is, work backwards, saying the film is ISO 400 by definition and your light out put is 2 millilux-seconds at the 0.1 point after you subtract all the density you have between the lamp and the film. That is the way I calibrated mine.
Originally Posted by Bill Burk