VR1. Mineral or full synthetic

I run VR1 Racing with a comp cam zinc additive. I lost one solid flat tappet cam months after companies removed zinc additives. (True, cam was getting a little long in the tooth) But? A little too coincidental to trust not. They say it's "High Zinc" But wasn't at one moment in time. So far no issues with new cam of very similar profile with the additive.