I saw your groups in the other thread where you only used blank targets. Why is that?
Old drawing rolls on A0 size paper I kept for kids doodling and colouring.
One sheet pretty much covers the core-plast target backer at the range and I can just put 15 or so black pasters up and shoot a decent while without having to constantly go check the target.
The plain white background is ideal for clearly seeing shot placement with the spotting scope.
The statistics you put up is interesting reading for sure, and yes, there is considerable differences of opinion on what is 'right' and what is 'satisfactory' with respect to group reporting.
I doubt though that you'll ever convince a statistician that there can be too much info.