you didn't say what kinda game yer after, but for anything up to deer, and to be kind to yer bow, i'd stay above 9gpp; 10gpp would be better. this'll mean a total arra weight of around 500-560 grains.
point up with whatever weight will yield the total arra weight yer after and see how it flies.
i use the same carbon shaft for all my bows that range in holding weights between 40# and 55#, changing the front end weight to adjust total arra weight, gpp and foc. i stay above 9gpp and below 11gpp.
for the 55# longbow, i can adjust point weight to yield a 505 grain arrow for speed at longer distances (i.e. antelope), and a 610 grain arrow for penetration at shorter marks (i.e. hog).