Great, I do most of my cooking at 225, but on occasion I'll bump it up. I wanted to make sure you were not having to use more fuel than necessary to maintain your temp. I am thinking out loud, with your FB to CC opening being way smaller than it should be, You can get the CC temps up but you are having to use more charcoal/wood to accomplish this. With a larger opening more heat and smoke can get to the Cook Chamber faster and hold heat better, that way smaller fire, less fuel and easier on you. Just Saying
I love smoking as much as anyone, but I don't want to have to use more fuel than necessary and spend my time monitoring it to make sure it stays up to temp. Since you live in Irving you and I have about the same seasonal temps. I like to smoke all year round and when it gets cold it will effect your smoker temps, so you want it to be doing its job and not make it harder on you.