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Really interesting Sebboh! I spent a few hours yesterday retweaking the FLE of my Contax but to get it back to how it was before I last regreased it. I took the lens away to Scotland a couple of weeks ago and found all my stopped down infinity landscape shots a little lacking around the midzone but not terrible in the corners. So I played around with the infinity stop and also the FLE, as I found that my copy does not reach infinity in the corners at 1.4, due to field curvature, so I adjusted so that the infinity hard stop now is optimised for the corners wide open, which I hope means stopped down I can get a better balance of cross frame sharpness, I'll need to test if the field curvature changes at different apertures but don't have much landscape in London to test with.
I find the lens is sharp in the centre at any FLE setting, so I'm not really surprised that you have been able to modify yours to provide better bokeh. The effects are impressive, but is it now only sharp near the centre or can you get a sharp subject at the edge of the frame? I've concluded that no matter the FLE position I can never get a great performing mid zone towards infinity, but everywhere else the lens is performing great. Looking back through old photos before I first adjusted anything my stopped down landscape have always been pretty unsharp except for the centre, even at f8, so I have basically not achieved anything but learnt a little. My copy is now back to stock except maybe for the infinity position.
Have you noticed a mid zone drop in your copy? My corners seem better than my edges both wide open and stopped down, and the FLE doesn't help, just shifts field curvature around in the corners.