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Hmm, that's a tough one. I was basically asking because 2620s were like a magic potion for me. Not sure I understand your cleat placement but I agree with @Alf0nse that slammed back is where its at. Also, what shoes do you wear? Have you tried more than one pair? For example Lake's will allow your cleats to be really very far back, whereas shoes from someone like Specialized don't have much adjustability in my experience.
off the shelf, g8 performance pro series 2620 and some generic ones from the NHS.
custom - Sidas form fitted to my foot
Not going to name/shame the fitter as to be fair it was an general 3hr long fit with a focus on foot/shoe setup, rather than with one of their podiatrists as that was recommended first. I just dont have the cash or belief another appointment will solve it at this point.
Weirdly it did seem ok during the fit, but it was on a turbo where I dont think the same pressures apply compared to cycling irl? Cycling on the flat is generally okay but still there a tiny amount