Oil light stays on too long on a cold start

I haven't checked lately, but it wasn't that long ago that there were old vs new application filters identical in dimension thread etc. that were with & without anti-drainback
"flapper-rings" incorporated in them, something to watch for when asking for a filter or looking it up. I can't imagine why one would be manufactured w/o one these days.
The slanty I built had a lot of oil press cold with 10w-40 in it, like 90-95psi cold, it would idle hot at 20-25psi & peak close to 70psi wound up. I ran into the flapper failing
after 3-4 days driving, I could count one thousand 1,2,3BOOM!! oil pressure!! I changed it, same thing 3 days later, changed it with a different brand,..3 days later ditto.
Tried a 3rd brand and when that one gave it up, I moved My coil to the inner fender, and mounted a remote filter base there angled towards the opening in the K-frame.
The rings all looked deformed, like a ruffle edged throw rug!! LOL!! No idea to this day why and I had 2 other projects at the time & wasn't about to perform a forensic
engineers investigation over it.