That's what I was trying to suggest. Wow shafts do range, considerably, in gpi. They get heavier as spine increases. Then there's the point weight to add.
The arrows you are used to are roughly 10.5 grains per pound. That's about as high as I like to go, and what I usually end up with, +/-. Go up to 11 or higher, and you'll probably notice a real difference in trajectory anywhere around 20 yards or more.
I'm pretty confident you could go with 45/50's or 50/55's, tweaking with point weight and length. You have some pretty good guidelines above for what point weights would work. Hence my suggestion to guesstimate the best you can to figure it all out and go with a shaft weight range that will put you in the right ballpark. It will be worth it to get premium shafts from a trusted supplier to ensure that.