Bill, the "P" does look high, but you need to run a "simulated" smoke (not in autotune mode) to test it. Leave your bricks in there, and set C01 to 225, t, 2.0 hours. Turn the cold smoker on, and test how it rises to temp, and how it holds. I'd do this before testing with meat.
Thanks, so much, for the kind compliment! I'm a little passionate about SI smokers, and mainly our great group of fellow smokers here, so it's all fun! I'm blessed to be a part of the SI team!