I don't. I can sort of see an advantage in slight overdevelopment, since it will increase the contrast that may be lost with diffusion, if you photograph scenes with low contrast. But in general, I think you can dial in whatever small differences you may encounter with no extra development, and there is also no problem if you every want to use another head--not that there is any real problem in the real world, just dial in the filtration, but 'in theory'...(posted 8678 days ago)Adams says develop a little more for diffusion heads, if I recall...