New to the griddle world, got a CharGriller FlatIron and am really enjoying it. I was never a very good griller, but I am going to try on this griddle. So I made smash burgers tonight for my sons b-day and a few came out with that seared caramel color but most of them just were brown cooked meat, still very tasty. How do I get that crispy glazing out of 80/20 burger?