The more big cooks you do on it, the better it'll get sealed up. Also, there is nothing wrong with cooking @275, you just get done quicker and can spend that time doing other things, or sleeping.
Rescued 22.5" OTS. SJS Mini-WSM. HEB briqs (rebranded Royal Oak). Pecan/Hickory/Cherry/Apple/Peach woods.
2016 Fuji Absolute 2.0 LE (for burning off all the great BBQ)