I would assume the zrrows will be cut to about 31 inches.I shoot 2018s and 2016s out of my bows that are about 50#s at 30 inches and arrows are cut to 31.Which one I use Depends on the specific bow and often whether its cut to center or not like Aromakr said.
With a high performance bow, a 145 grain broadhead,31 inch arrow and FF string think a 2018s is gonna work well.You could use an even heavier head if they are spined a little stiff.
i personally like the 2018 for a hunting arrow.Its tougher and has a little more weight.Might be worth trying to tune that arrow to the bow playing with point weight.