C J,
I also shoot the 35-55 GT Trads, 28" BOP, shooting a 45# Toelke Whip Classic. (aggressive r/d). My total arrow wt with wraps, 4" helical fletched shield feathers, and 200 gn points, is 500 gns. (I'm using the std 10 gn al inserts). This set up shoots down the middle for me. However, if I shoot them with my 40#, Mohawk, (mild r/d) they group to the left of center.
I also have some bare shafts made up, but I'd put the 50 gn brass inserts in them so I use 175 gn pts, and they will also group in the center, at 10 & 20 yards.
With your set up and arrow length, your arrow spine should be weaker than mine. So, before I spent more $$$ to make a change, I'd stay with what you have for a while. Two weeks isn't a long time in the world of Trad shooting!
Enjoy, and Have Fun!