First packer brisket saturday

I'm doing my first packer this weekend for family. It is a prime 16.8lb monster. Still need to trim it.
I've done a lot of reading so I think I know what I'm going to try as far as cooking it. Was going to cook it at 235 until temps reach 200-205 IT on the probe then butcher wrap and put in oven in 170 to rest. Was going to try a simple sea salt and pepper rub, but not sure yet.
My question is, do you prefer the top or bottom rack for cooking brisket on a YS640? It may not even matter, but wanted to ask.
Any idea on how long this will take to cook?
I've done a lot of reading so I think I know what I'm going to try as far as cooking it. Was going to cook it at 235 until temps reach 200-205 IT on the probe then butcher wrap and put in oven in 170 to rest. Was going to try a simple sea salt and pepper rub, but not sure yet.
My question is, do you prefer the top or bottom rack for cooking brisket on a YS640? It may not even matter, but wanted to ask.
Any idea on how long this will take to cook?