I agree with Necrotic. 0.3 ohms will give you ample headroom with a 20A battery. Any time you see a 35A battery it is most likely 20A continuous. See blog #17 below.
As you are new to mech mods and rebuildables I highly recommend you spend some time with Baditude (our resident battery expert) and visit his blogs. You are now 100% in control of your own safety (and others around you). Once you have mastered this you will be able to answer your own question.
Baditudes Blogs. The blogs regarding mods and rebuildables are listed below:
BATTERIES
9. Battery Basics for Mods: IMR or Protected ICR?
* Another essential read to understand which batteries are safe to use in mechanical and regulated mods. Includes a frequently updated list of recommended safe-chemistry, high-drain batteries with their specifications.
17. Purple Efest Batteries Not As Advertised
* A cautionary blog that reveals that the purple Efest batteries may not have the specifications advertised. Also includes a commentary on "continuous discharge ratings" vs "pulse discharge ratings" of battery specs.
OHM'S LAW
14. Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.
16. Explain it to the Dumb Noob: Ohm's Law Calculations
* As simple as it is to use, some people have a tough time grasping the concept. Warning: Includes graphic photos of mod explosions.