Wife ordered it for your birthday?
Wow, what a great wife.
Yeah, if you get the grill up to 600F internal, based on the thermocouple reading that's between zone 3 and zone 4, your direct grilling area zone 1 will be well over 1000F. My IR Gun goes to 1040F, and I've seen it unable to read because it was hotter then the gun could read...
Generally any more, I rarely use my PG500 above about 400F. I think at 400F, your direct grill side is probably around 700F, which is plenty hot enough.