You should try precooking the mushrooms a bit, I find they work better on pizza that way as they can release a lot that water content so it doesn’t get on your pizza and prevent browning, they don’t take up so much room on the pizza that way too so you can get a nice heterogeneous mix of exposed cheese layer and toppings during the bake. I like to give them a little fry with garlic and butter but you could use olive oil. Gotta pull them off the heat just before they get nice and golden otherwise they burn in the oven.