if i wuz you, i wouldn't use an arrow much less than a tad under 9gpp - not good for your bow or you ... or your bowstring.
do some 'sperimentin' - by changing only the point weights, make up one of each fletched arrow weight - 9gpp, 10gpp, 11gpp, 12gpp.
shoot each each at 5 yards, 15 yards and 30 yards.
your only interest is the trajectory of each arrow, not so much the flight (unless it's that bad). the idea is get a feel for each arrow's trajectory as it applies to the game you seek and that game's hunting venue, i.e. a flatter flying arrow for open country critters as opposed to dense woods game.
pick the arrow weight that works best for you, juggle the spine and foc to make it fly the best it can. a well flying arrow out of the most holding weight you can handle is the first biggest step for good hunting, imo.