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Hello. I offer my humble opinion: My thought is that you could set up a direction of travel from the heat/smoke below, up the back wall and out of the stack. I would place the stack in the center of the top. Force the smoke to circulate through the whole smoker. Just my opinion. Keep Smokin!
From where your AMNPS is I think I would have gone for the front top, to draw the smoke forward over the food. Looks like the smoke could short circuit up the back and out.
Having said that the air flow might be quite slow as you have electric heat so might not make so much difference.