I have a Summit 6 burner that I rehabbed, my first rehab thanks to all of you guys for the insight. My question is how hot should it get? I preheat it for about 10-15min, its NG, and it tops out at 550 degrees. 1. is this normal? and 2. is there something I need to check? I realize that it doesn't need to get much hotter then that but I just wanted to know what was up. Thanks