I have been replenishing 1 1/2 oz per 80 in sq with my homebrew. No noticable changes in development so far (two months) but no quantifiable data either. Seems to me to keep the level up continuously would be the more sensible way to approach this. I have just done some testig on the new J&C100 (lucky?) 4x5 film so I have a benchmark. The curve looks pretty straight I have a calculated speed of 100 with an average 'G' of 0.82 with an SBR of 4.1. Does all this make sense?
Anyhow, real life results are quite nice with the Buffaloe 777 developer.
tim in san jose