I just punched in my information at bowjackson.com to see if my wraps and vanes with a 28 inch 400 spined beman camo hunter arrow is ok to shoot with 100 grain broadheads. my test came out 8% foc......is this good? what is optimal FOC?
You can increase FOC by either growing a longer shaft or increasing point weight. You could make a very very small difference by removing the wrap, but it wouldn't be worth it.
It doesn't seem like your FOC is calcualted correctly to me though...in fact, when I put something similar to your stated arrow, it comes up as 11.9%. This is for a 3" feather, which I am guessing should be close to 5gr. and no wrap.
With the gold tip 5575, the inserts are 15 grains. 23 sounds like those ones for the easton carbonaeros. The weight would only be a rough estimate. Mine weigh 380 w 4" vanes, 100 gr point. They're somewhere around 28" long so it should be close.
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