I do use the Versalab, level absolutely everything (incl the easel of course) and will hopefully be getting my hands on a 60mm lens to see if there is any change. The shame is that my 105mm is so insanely sharp, but too long a FL. with grittier lower res images the 80mm is fine (not as sharp as my 105), but when the 60 or 63mm arrives it will be interesting to see what happens. I have a feeling that something is going on withs crunched up bellows or something and it is not all about the lens coverage/mag ratio. I will report back when i have tried something a touch longer than 50mm.