Plug read, opinions needed

Update, I went down to Westech yesterday to return some arp 12 point bolts we used in my balancer and brought my plugs with me. I walked in right in the middle of an engine masters shoot, oops. I apologized and said I’ll come back but Brule actually took time from filming to come examine my plugs, I can’t say enough nice things about him. He was thrilled that I cut all the shells off as he says his customers rarely do that and bring them back for him to look at. Said it’s nice to see his equipment is still producing results he expects. He’s happy with the fuel ring, and where the timing is at, as well as the heat range at 7 and has exactly the same opinion on the dark mark at the end of the ground strap as I, and some others here have. He said it’s likely some turbulence in the chamber and where the plug is located. I asked about indexing the plugs and he said he’s never seen it make much difference. He also told me again he doesn’t like the projected tip plug and told me I probably won’t see that mark show up with a standard tip plug. I put a set of NGK R5671-A7 plugs in it and will come back after the engine is in the boat and I make a couple runs to show you guys what the plugs and the tune up looks like in the boat.