That sounds like a Gen 1, but I am no expert.
One more bit of advice, place your smoker on some sort of table. I fine a cheap used bedside table works good and is cheap. Get one you can saw legs off to adjust the height lower if needed.
Then move your mailbox lower. The draft from the mailbox to the smoker is as important as the one out the discharge.
Elevate the smoker, lower the mailbox, add a bit on length to the smoker discharge and I think your AMPs will draw an excellent draft. I think it will cure all your problems.
By seeing your location, you gotta realize we are going to lose the ability to cold smoke soon if not already. Unless you have a walk in cooler to use your smoker in. <Chuckles>
MES temps have a notorious temp. history. But I am sure you are smart enough to offset the difference when setting up for a smoke. Its not NASA, they are Chinese built, they are like hand grenades.