Extra fabric on back of flannel shirt

So for a dress shirt if there's extra fabric in the back I'd add darts, but I dont think darts on a flannel shirt is a good idea. I leave my flannel shirts untucked and there is this big spoof of air in the back.

I know some of you might say size down but I need to find a size that fits my shoulder and chest and usually that means the waist/lower back area is huge
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