I just want to point out that there's a difference between an SP Melee Hunter and a Physical Melee Hunter. A Physical Melee Hunter will have very little to no SP. And naturally, a Physical Melee Hunter will cause more DPS.
If you have more questions, let me know. I'm probably the most well informed person about Melee Hunter.
P.S. There's also Zulian Slicer (ZG) which scales with SP and will be your main conduit of damage alongside Shadow Oil.