Agreed with most of your points, a secret pro-tip in terms of injecting…. Take your fat that you trimmed off the brisket, throw it in a tin pan and put it in the smoker next to the brisket, the fat will render into a liquid. Take the liquid fat and pour all over the brisket before you wrap, then save the rest and inject your next brisket with the fat for more flavor.
In terms of seasoning, you can never go wrong with salt pepper and garlic, I also add onion and smoked paprika for the color.
Mad scientist bbq has a lot of really good videos diving into the science of things and some really good tips as well.
I’ve found the longer I let my brisket rest, the better, just towel wrap it in a cooler like you said. I generally go 2-3 hours rest, but there’s no wrong way as long as you’re not cutting into it right away.
If anyone ever puts bbq sauce on my brisket they will never eat at my home again.
Lastly, when you wrap, turn the brisket 180 degrees to ensure both ends of the brisket get the same cook, as some smokers get hotter on one side.
Just Some of my tips and opinions, not telling you how to do it, I seen the pics and yours looks great. Keep up the good work brother.
P.S. -Pellet smokers are the way to go. I can’t be asked to manage a fire all day, plus my bbq is better than most people that use offsets so they can suck it
Also, to anyone interested in buying a smoker, keep an eye on offer up, I’ve bought 4 smokers all in brand new like condition for 150$ or less each time, just takes some patience.