Oh I see them now, can you get your hands back there to feel the pressure of the suction those are allowing into your cab?

You know, squeeze yourself back there when the thing is closed and running and slap your palms on both of those 2" holes and see how much air is really moving INTO the cab, your exhaust looks A ok to me

And like I said, your temp reading of around 82º F will go down when you have your fans on 24/7