Yeah so, I am not a super technical archery guy so can’t offer a really informed opinion. I will say My bow is on the heavier side too. 76#, 30ish draw. Moves my Maxima red 438 grain arrow a touch over 300 FPS.
After 2 years, I wasn’t thrilled with the Maxima reds (Groups good but not great and they break a lot) so I just bought some 260 and 300 spine axis to try along with a 300 spine fmj. Haven’t shot them yet but they are All stiff as hell compared to the Maxima reds. The fmjs are $12.50 each vs $9.50 for the axis (regular). And the fmjs are 12 gpi vs 10.7 for axis so on a 30 inch arrow you will pick up 30-40 grains of extra weight. The guy who built my arrows said the fmj was a bit of a pain to work with. Needed a bit more filing to remove burs from the cut. He is a serious shooter (Bow shop jockey / hunter / target competitions / 100-200 arrows a day) and said he prefers the axis.
If they shoot roughly the same, I am inclined to go with the axis.
After reading some posts on here, I also ordered some iron will collars and had the arrows built with 50 grain inserts. I am going to play with the components a bit but as posted above I am thinking a 125 grain field point for practice and a 25 grain collar plus 100 grain broadhead for hunting. That formula will add roughly 100 grains to my arrow and should be more durable.