65 is the number I also often hear. I've seen them smaller sized wasp jack hammer mechanicals (1,1/4 inch cutting diameter) perform flawlessly on deer with less energy.
From what I gather I should be good?
My arrows are 28.5" long
I was shooting my axis which are 417 Grains at 289 FPS
I now have VAP arrows but have not Chronoed them but they are 386 grains. I suspect they fly faster.