I have limited experience, but am finding that my imagon 12" on 8x10 has a very sharp center that moves around with front tilts and swings and makes it hard to use movements as one might with a sharp anastigmat. Left swing moves the sharpest part to the right on the ground glass but doesnt really bring other areas into equally sharp focus as I expect. Keep in mind these are outdoor scenes and not portraits. Am I just blind or should I expect different physics with a meniscus doublet compared to a new anastigmat?
Soft focus lenses generally aren't for wide angle use. You're probably seeing the plane of focus getting curved as it goes outside it's "coverage". Learn to use that feature or use smaller film with that lens.
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."