Commentary Inf VI 109-111
The notion of a greater 'perfection' for the damned suggests only that, since a soul united with its body is ipso facto better than a soul alone, the ontological nature of the damned will be improved by the restoration of their bodies that will follow the Last Judgment. (For St. Thomas on this doctrine see DDP Singleton.Inf.VI.106-107.) However, and thoroughly in accord with the penal code of hell, this 'improvement' in their condition will only result in their ability to feel more pain.