Anne and Matt – OK that sounds entirely possible. The dough is stiffer, but you can see that didn’t have an issue with the KitchenAid, and it is only a 6 quart. But that is not to say it doesn’t get hot.
I recommend the following: One, be sure not to go above speed 2. And keep it on 1 as much as possible. Be sure to chunk up your autolyse so that some of that work is done. Do stop periodically to give it a break. And certainly you could incorporate the porridge early in the game. We all know that works.
In addition you can take a note from one of our dear bakers, Kimbra Ong, who gave her KitchenAid a little cooling.