I havent done too many pizzas on the Summitt but I learned from kamados when cooking pizzas indirect you want to get the pizzas high in the dome to use the heat from the top to melt the toppings better. I also learned never to use that stone in that holder again it almost ruined this pizza as my peel doesnt fit between the handles and i had half the pizza on and couldnt slide it on any further. Not fun struggling over a 650 degree grill.
i guess i got lucky, the pizza peel i have is aluminum and fits the stone perfectly with the rack but i know what you mean that the peel could be an issue i went through the same thing as you when i tried using a wooden peel which was to big, the jumbo joe lid is not as high as other webers so more heat is on top my pizzas cook at 500 to 600 degrees and take less then 5mins check out my posts and you will see what i mean. I always say what works best for you that's what is nice about this site people helping people.