I'm no longer into incans; I just sold my Rattlesnake 168A (18650) extender and EO-13 to a CPFer in Germany. I still have my Rattlesnake and seven or eight different D36 lamps: 9v, 12V, and a Wolf Eyes 13V. The Wolf Eyes 13V, from what I recall, delivers a pleasingly wide, bright, white beam and would make a great match for three 18500, Wolf Eyes 150A, or Pila 300 cells. In the 9V (2-cell) range, my favorite is the RICO Alpha-9, for the same reasons. The RICO draws about 1.2 amps.
The 700-lumen EO-13 is strictly for throw. Lumens Factory doesn't recommend it for continuous use.
Have you considered LED D36 drop-ins? I don't think NailBender's will work in Wolf Eyes, but have you looked into D36 LEDs from Wolf Eyes and Lumens Factory?