Here's how I would handle it for 5160:
1. grind to at least a 120 grit finish, leaving the edge at least .040" thick (generally the thicker you leave the edge, the less warpage occurs)
2. Heat the blade to 1550F (NO SOAK)
3. Quench in light oil (lots of choices here)
4. Allow the blade to cool down IN the oil, while your tempering oven is pre-heating
5. Temper at 350F for two hours. (I do a total of three tempering cycles, allowing the blade to cool to room temp between cycles.
I add a couple more steps in what I do.....I thermal cycle the blade 3x prior to hardening. During the third thermal cycle is when I stamp my blades.