Wolverines are noted for the sensitivity. This strain was nearly impossible to keep before some of the more durable lineages started showing up. Generally, they fall into that 'low par high nutrition' group and as such seldom thrive in mixed reefs or when placed under high par.
You've had them a year so clearly you've got them in a sweet spot.
All too often with zoas we begin with parameters (which we should) and then get stuck on that, or rogue aquarium inhabitants. Really, the top two killers of zoas are 1) bacterial/protozan infections and 2) malnutrition.
These appear to have picked up a minor infection that is still very treatable. I would advise against a peroxide dip and CoralRx only gets you so far. I'd suggest either a series of mild chemi-clean dips or treatment on the aquarium coupled with a Lugols dip (can combine with with chemi-clean in a single dip). I've also found Metroplex to be effective when used as a dip in conjunction with the other two I mentioned.
As we do more research and continue to look at the microbiome (via tests like AquaBiomics) and its roll in coral disease and pathology I suspect we're going to learn a lot in the coming years about how to diagnose, treat and even curtail the transmission of pathogens in our aquariums.
Whichever route you go I wish you luck. Seems like you really had them rolling, hopefully you can get them back to good health.