Quick update to my post above. I upgraded the firmware one version at a time up to the current release. re calibrated everything and flew again. Image still perfect. (Art -1,-1,0). Reading the posts and others' experiences with resetting the camera to PAL then back to NTSC, which hasn't worked for me, I'm convinced it's an issue with a script that runs each time the software boots up that is compounding or overwriting some settings, leaving traces which are causing the issue instead of wiping & reloading. This is possibly made worse by new users like myself who experiment with all the different settings Etc. which is creating a lot of garbage in the cache which can only be purged by reinstalling the firmware. The success that some of you guys are having with PAL>NTSC resets is fixing the camera element by doing what the software should be doing automatically each time the things' powered up. If that's correct then presumably an easy fix to build into the next update?
Yes, I tried to explain that to DJI, that is most likely software issue, with instructions and images how to reproduce it... the problem is they are still convinced this is "lens misalignment" because they are jumping to conclusions and in a fact are not listening to the customers. Their customer support is just reading from script. I tried to convince them to send my report to some R&D folks but I think they ignored it.