That sounds more broken in Zero than Opto, which I think is more HSS than a Proxy.
GL is my favorite Pure plastic, it beats in at a slow but perceptible pace. I'd try another before giving up on the mold.
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I will give another pure a shot, because it feels so good in my hand. It's so weird that I can't get a good consistent release on it. I think I may give the Proxy and shot if I can't get along with the Opto Pure. I love tossing my Envy, it's such a great approach disc.