Have you tried formalin dips?
I'm dealing with something similar, but not exactly the same. I think I did have an original fluke issue, but with repeated treatments the issue did not completely resolve. Now I'm seeing what I guess are a few ich spots here and there, along with opaque/cloudy blotches, which I originally thought were skin flukes until nothing came off in a FW dip.
Now I'm doing TTM on all the fish to eliminate ich as a possibility. Also doing formalin dips and antibiotic (NFG) during the course of TTM. Maybe it's just because I'm paying more attention, but I think theres something nasty circulating in the hobby... seeing a lot of reports of flukes, prazi-resistant flukes, and unknown issues.
I haven't. I did use Paraguard. I'm in process of hypo right now. The flukes do not look like normal flukes at all they look like WHITE STRINGS 2MM LONG FIXED ON THE SKIN (not dangling). This is very weird and at 1.012 they are not dying so I'll drop the salinity even lower.