I found that with single battery hitters vaping low ohm builds, dual builds or the fancy multiwire builds the single battery can't push enough out especially if its a older batt or worse yet clone or counterfeit batts. Cheap batts other than what mooch recommends for the build to fire properly don't have enough knards even using a mod, your still at the mercy of your battery with or without a regulated mod. Even a new batt begins to loose its perk sooner or later. Its taking too long to ramp up the clapton builds and by the time they heat up enough nothing left in the battery for your vape. That can be solved a bit by taking a couple smaller vapes to warm up the coil before the vape thus the battery recoups a little between the smaller hits so the coil is nice and hot to take a good vape or blow down some till a nice plumb comes out the airflow then take your vape.
You need a 2 or 3 or 4 battery mod to fire those dual claptons efficiently. 1 battery mods really begin to fail after 40 watts unless you have a supply of new batts, the older batts loose their kick ramping up so really crap out when the power is needed. Same with internal battery mods, the batteries are questionable to begin with and once the battery dies and don't hold charge you have to toss a perfectly working hitter.