Fantastic! Do your chrysopterus actually go in the nems or just sit next to the bases. This has always been an issue whenever I've tried this combo. I believe certain geographical variants of chrysopterus are more/less immune to a magnifica's sting. I've had Marshall Island variants that acted like they were shocked when they touched the tentacles of the mag they were kept with. They would sleep near or against the anemone but never enter into the tentacles. I've never kept the Fiji/to ga variant, like yours, with a mag though.
I do know that in places like French Polynesia chrysopterus are found commonly in mags.