Many are trying to gain an edge. Maybe it is because they are following the vintage recipe?! I personally like flat poles except in the lower output formvar sets. It is all just spins on tradition I suppose.
Materials are about the only thing you can control. Otherwise they wound scattered and random. So tight, some looser. Some hot, some low. Played many PAFs and as stated above, most were good, some great, and some were not good. Just like any guitar made back in the day.
I would say the flat pole (not flagpole) Signature is the most scooped and closest to the Blonde as it is alnico 2 magnets which has a softer attack. The 64 is a bit hotter and A5 so it is a balanced, clear attack like a piano.