Let's assume that the broadhead and diameter of arrow are constant...

Energy comes from weight and speed...But, you don't really have much difference in the speed from the slowest arrow to the fastest...I see this alll the time in muzzleloading, folks want to argue about a few fps when all that fps does is makes the projectile fly a little flatter...

I notice you shoot a pretty short arrow, I'd opt for the heavier oneto give you more weight...

Now, I'm not like most bowhunters...I shoot a bow that's pushing 20 years old because I still shoot fingers...I'm also 6ft 5...So my arrow length is 32 inches...I still shoot aluminum and use 125 heads...

Even with this old, slow setup, it shoots flat enough to use 2 pins out to 30 yards and the arrow exits on lung shot deer...