I understand your concern, but transplanting now in the middle of flowering will cause more problems than benefits. I would leave it as is, add an air pump where the roots are, and create a mixed system between substrate and DWC. Transplanting, as you mentioned, will inevitably break some roots, damaging the plant, its nutrient uptake, and causing stress that will slow or halt flowering, leading to loss of weight and final quality. I hope this helps with this and future grows.