I didn't know Gold Tip made a 100 spine. Just what arrow is it? Just a guess, but I would think you should be using a 300; even 340 being on the light side. Now that being said my Ryteras with Cat/Hybrix cams gave me a left tear till I finally said the heck with it and just tuned for best flight/grouping. If you field points and broadheads are both hitting the same spot out to 40 yards I would suggest closing your eyes at the shot. You'll keep more hair on your head that way.
And NOW, that being said, after three years I finally got a bare shaft to fly decent. At 47# and 26 3/4" draw I tried a 600 spine with a 125gr tip up front. Kinda told me that my assumption that I should be shooting about a 730 spine with an 80gr tip pans out fairly close.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver