Is your tail a basic or a partial? That's one thing I've noticed with merrowfins quality- the partials and full silicones are constructed, look, and perform 100 times better than his basics. Your fin attachments look very similar to my basic tail (I ultimately got rid of because of the same issue's you're facing). I'm so sorry you're dealing with this.

Sent from my [device_name] using MerNetwork mobile app