Beautiful hunting bow with perfect tiller! Also nice work all around. And great Colorado pics, always want to visit the US when seeing such great landscape.
One note about the string:
I use the same material and use 2x3 strands up to 70#, 2x4 strands up to 100#.
One strand breaks at 70#, I've tested.
Reducing the string will bring that 5 fps you have aimed for, test it!
To fit the arrows, just make a double serving at that place where your 3 fingers are.