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The goal is to find arrows that will fly true to your target (with no "fish-tailing" or "porpoising") once you've released the arrow and it has finished going through "archer's paradox". Very basically, the factors that dictate what arrow "spine" you require are:
1. How far "past center" your bow's shelf is cut, and
2. Its draw weight at YOUR own draw length (plus some other minor factors like what string type you use).
The more weight you place near the front of the arrow, the "weaker" the spine will be. If you shorten that arrow, it will spine "stiffer". Carbon arrows tend to have an extremely high strength-to-weight ratio, and alter their spine much more readily from changes in LENGTH, rather than point-weight. So many people here suggest distributing more of the arrow weight up front with carbons, then cutting of length from the back end in small increments to get them flying straight. Some even replace the aluminum inserts with 100 grain brass inserts to get a high F.O.C. (front-of-center) balance point. I think GoldTip has their own specialized inserts where you can thread more weight onto the back of the insert. I've never tried them.
Just a note: At 6'2", and a draw length of 30", that 58" Grizzly may not be long enough, and cause the string to pinch your fingers excessively at full draw. Hopefully you won't notice it.
I hope that helps. Someone who knows more can continue from here.