I bought a lapping kit with glass. There were 400, 800, 1000, 1200, and 1500 grit. I controlled every movement, and it took me damn 6 hours to get the silver corners away. After that i took 800 and 1000, and then made it finish. My load temp got 6-7 C worse, and 3-4 degress worse in idle. So I'm...