Hi jasperandecho and welcome to the forum. Sorry to hear about your guy and his runin with the filter.
Has he had any other symptoms like lack of appetite, darting and rubbing, or bloating?
The good news is I don't think his scales are pineconing. It's just that the mucous is making them look more defined.
It appears that he is reacting to either a topical bacterial infection from his wounds or external parasites, either of which can cause a fish to overproduce slime coat. When there is a lot of slime coat, the body can sometimes develop a cloudy film like that.
The Maracyn Plus should be helpful for a topical bacterial infection so I would recommend continuing with that for the recommended time of dosage. If he hasn't shown any improvement, then it may be time to try a stronger medication.