Being that the 1.8 needle and seats were $20 each, I decided to try the 470 mains. I installed them, put in yet another new plug, and ran WOT for 4 seconds. This time the dull/shiny line was right in the middle of the bend of the ground strap. (I'll be returning the needle and seats...)
I took it for a short ride. It still doesn't make much power, but it's definitely different. It's only running a little over 8000 rpm, and seems a little rich. For some reason, the right side cylinder runs around 200 degrees hotter than the left while cruising mid throttle. At WOT they even out more, and I was seeing 1200 degrees. When I pulled the plugs, the insulator is a real dark brown on one side, and a light tan on the other. I don't know what that means???
I went with 470's with plans to turn the adjustable main in to lean it out. (It's still adjusted full rich).