I'll be durned. I've always sorta scoffed at resting too long but I'll make sure i factor it in next time!
Def factor in the rest time as well. Also, can't specify enough resting "tightly" wrapped in n foil after venting. If you're going to be resting it in a cooler wrap the wrapped brisket in an old towel. I don't go overboard with throwing bunch of towels in there either but just one towel.
Took me a while to figure out the key to an amazing brisket was the proper rest.