I would consider insulated the concrete slab of the crawl space and look into further ways to reduce thermal bridging from the rest of the foundation and main floor. I would look into reducing the thermal bridging from the ceiling joists and 2x6 walls, I expect a material would be laid on the outside wall stud sides
In short I would study up on thermal bridging and see what can be done or what you want or can afford to do.
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