My wsm running dry i can add 3 butts and it would recover temps in 5-10 min or so, if i had all vents open 1/2 way id be running 400, i usually ran 1/4 inch or less open on all 3 vents.
Fire & Spice Cook Team
Backwoods Authorized Dealer
Stumps Platinum 5 on a porch trailer
Old weber gasser
Uuni pellet fired pizza oven