At 225 to 230 you should not need to reload any charcoal. Check the temp around 8 AM and if you are not through the stall then bump the temp up to 245. That should get you finished around 3 PM. That gives you plenty of time to rest. They are all different so maybe earlier maybe later.
I like to cook my butts at 235, but i am usually cooking two at a time and i try to schedule out for an 18 hour cook.
The first time I make something I try to stay somewhat true to the recipe so I know what to adjust the next time. You didn’t use all the salt and you didn’t take off the point and you didn’t wrap, and you cooked 4 additional hours. As far as dry spots were there spots that did not stay submerged in the brine ? But it still looks tasty 👍
Today was steak day, I’d been a little under the weather the last few days but feeling better today so went and got a nice thick porterhouse 👍
cooked at 250 until internal temp got to 110, then rested before searing caveman style.