Very nice Jim! Haven't seen you show that one before.
It's a total BEAUTY!!!
One way to cut down a bit on the overspeed potential that those mushroom burners provide, is to move your safety valve counterweight all the way inboard, so you don't develop as high a boiler pressure. I even use just a folded piece of sheet lead that weighs far less than the stock weight, so that my boiler pressure stays much lower (though you do blow off more excess steam) than when the full stock weight is in place. Closing off of one burner head is a very good way to go as well, so that a combo of the two techniques may get you where you want to go, although your Baker Fan may really be the best way to slow the beast down!