I learned from some smarter people than me that the amount of center shot/cut on your riser is more a tuning factor regarding spine weight than the actual draw weight of the bow.
I've shared my Griz AK test kit (3 fletched/3 bare) with others and they drew more weight, but had bows cut to 1/8" shy (longbows usually, some recurves) and ended up with my set up being too stiff...
On that same point, my Morrison is cut 3/16 PAST center cut and it is only 54# at 28" and shoots just close to weak while the big boys drawing 60# to 67# (same draw length) but having risers cut SHY of center, found my arrows STIFF.
I'd follow OL's webpage set up for testing bare shaft and start cutting, adding weight, etc. as needed to get perfect flight. FWIW