So I should rebuild to about .2-.3 ohms to be safe?
No!
@jaspurgeon10 I advise you to stop using your Nosiey Cricket until you understand Ohms Law. Do your homework and learn what is safe, for your own sake.
^This
Voltage / Resistance = Amperage
Amperage is the important thing for safety, you need to keep it below the Continuous Discharge Rating. So for 20 amp cells lets solve this problem.
NC is a series build, meaning double the voltage. 4.2v *2 = 8.4v
So 8.4v/XΩ = 20amps
8.4v/20amps = XΩ
X = .42Ω
That's your downward limit on 20 amp cells.
Now realistically you can push further, and some 20 amps are better than others and blah blah, these are rules put in place to make it nice and easy, follow your CDR and you can feel safe, push it and you may have problems if you don't know the potential issues. This is especially true for a hybrid top mech mod, it's already dangerous enough.
Now, I have some higher rating batteries, and I've gone down to .35Ω, and holy mother of pearl it smacked my lungs hard. I now have a .48Ω build and it's nice thick tasty clouds of warm but not hot vapor.
Anyways, I'd go back to that vape shop, and give it to the guy to vape then go hide behind a shelf, that or tell the manager there that his employee is a dumbfuck.