I never used the 3000 drums, but I think we are going to have to agree to disagree. From other posts of yours, I can see you are an experienced darkroom technician, as am I, having worked in large commercial labs that used nitrogen burst systems and holding an MFA in photography. For my own film I get very consistent results in my Jobo using C-41 and reels, and even 8x10 film in print drums. In my own experience, the biggest factor for consistent results was making sure the developer was mixed correctly with the proper amount of starter.