There is nothing wrong with the grill temps used by scooper, probably why it hasn't been addressed.
Great looking chicken Scooper!!!
You can start out low and then go high at the end or the way I do it is go right to 300. The higher temperature gets the birds done a little quicker and makes for a nice crispy skin! Also, to me, keeping the temperature consistent provides consistent heat to the meat, which I prefer.
Have fun with it!