I've been using the kodak ra4-rt for a while now, but this is new. A consistent light falloff is appearing on prints that previously did not. It is cylindrical from the center out, and dissipates at equal proportions. I've always had minor lens falloff, but was able to do 10-20 % time burning to compensate...now it's up to 60-80%! It starts after the 1st replenishment, and get progressively worse with each print, but the centers continue to be properly exposed. Weird. I've compared the current meter readings to last year, and have ruled out the lamp, and all other associated enlarger mechanics. Is it possible that the developer is acting proportionally less aggressively with the existing decrease in lens falloff exposure? Thanks.