This sounds about right for 18350 batts as these are small. If you want longevity out of your batts I would use the 18650s with the extension for the vamo. Efest batts are good, I have two of them myself and have been everything but trouble. AW IMR batts are good also, a lot of people recommend these batts(AW)
At the end of the day 18650 AW or Efest are going to be your best bet for what you want.
Good luck and I hope this helped.