From what ive seen (general rule of thumb) the lower the mah rating the higher the amp rating. Could be wrong but im pretty sure im not. Ive been using those efest batts and my vtc4s for my entire vaping journey and havent had any issues. No hot batteries, no hot buttons, no decrease in battery life or anything. I actually prefer my efest over my sony. To each their own but ive built from 1.5-0.15 and only had a battery short one due to a 510 pin not being set correctly. And not one person has mentioned that these regulated devices have AMP LIMITS. It will only put out the wattage that it can handle at any ohm build.
Smaller mah on high drains mean less internal resistance. Less internal resistance means easier it is on Bart to dump charge.