So this is good info, and take it for what it is worth, an opinion nothing more. But, it is not only the wear dropping, but which wear is dropping. The copper dropping is totally normal, likely any oil you use copper would be dropping at this point in a hemi. The iron, also pretty normal drop to be expected just in engine aging alone. Neither likely has much do with redline versus another oil. But, the alum is a good sign and to me is more indicative of plating action and those additives in redline and HP oils specifically that is protecting that particular engine at start up.
I don't know your situation, for me I need to use things up, I even drove on oem tires and rims for a decade eventhoiugh I hated them, lol. So I prefer to use oil to it's limits. I'm just saying with lab proof you can go further on that oil with no risk of oil failure. I'll let you decide your interval, a 6k mile interval is indeed better, it's just about your values. You read oil filter thread as well?