I photograph landscapes in overcast, flat light, using Portra 160. My exposures are dead on. I keep getting problems with flawed development; this shows as faint brown smears in pale areas (eg. grey skies). My film is in perfect condition. I avoid damp, heat etc and am meticulous. I have tried processing in various labs but keep experiencing this problem. I scan my film and produce Lightjet prints; these flaws ruin so many negs. I have been told that one problem is that modern dev tanks are smaller than the very large old ones, and consequently the chemistry does not engage consistently with the 8x10 sheet; it has been suggested that I have a technician develop the film at a lower temp for longer. Does anyone have any experience or thoughts on this problem? I'd be grateful for help.
Thanks
Michael
P.S. example (in exaggerated form to make flaws more visible) attached
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