I don't really mess around with hydration rates above 68% very often, at least not for round pies. But what I can tell you as a good rule of thumb in general is that the wetter the dough, the quicker you need to make the pizza before it starts sticking to the peel. This might seem like an obvious fact, but what I'm getting at is that making pies like this with a ton of toppings is asking for trouble. Keep the toppings on your high hydration pizzas minimal, no matter what people ask you to put on them. Stretch the dough, top it quickly, and get it in the oven. If people want a lot of toppings, I suggest par baking the crust for a minute just to firm it up and then pull it back out onto the peel and top it the rest of the way if you're using more than just sauce and cheese and one or two toppings. And I suggest trying some semolina flour for peel dust, too. Use it alone or in combination with regular flour. I hope this is useful info.