Why? And why? And why????? Sorry
I don't think you understand the fundamentals of arrow performance. The goal is to have an arrow that flys straight. Adding weight to the tip to increase FOC is only necessary once you know that is your problem...most of the time the problem is a bow that isn't tuned right or an archer that isn't dialed in. You have to be very, very consistent to notice the difference a FOC change would cause.
Follow these steps:
Spec tune by trusted bow shop
Paper tune at bow shop, with a knowledgeable staff member watching your form
Shoot lots, if your groups are <4 inches out to 50 yards proceed to broadhead tune. If your groups are consistently the same size (for several sessions) but >4 inches at distance, go ahead and add a heavier field point. See if they tighten up. If they do, you re-paper tune, shoot lots, get sub 4in groups, then proceed to broadhead tune.
From experience, there is a very good chance a 330 is way over spined for a 50 lb bow regardless of cam design (you have to use adjusted draw weight, but I don't think it would get you over 55 adjusted so they will still be overspined) My guess is the guys you were talking to assumed you were shooting 60-70 lbs.
Your vanes are fine.
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“Nothing is more persistent than a liberal with a dumb idea” - Ebrand
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