I've drilled out one of my PT2 bases and also drilled 2 of the 3 holes in an EVOD base (from 0.031" to 0.039") and it helped in both instances. But (there's always a "buy" lol), I find that different flavors, different viscosities and/or different PG to VG ratios, and even my mood can affect how tight or loose I want the draw to be. And that's where the adjustability comes into its own.
Forgive me if this is old news; I'm still "discovering" things that may well be old hat to everyone else! lol
Besides there being different sized holes in the Kanger PT2 bases vs. Davide bases (and possible differences within the same make and models of atomizers) I have found there are several things besides just the air holes in the base that affect the draw. There's also the chimney ID, the base pin ID, as well as the fit of the atomizer base to the battery, how the threads fit (some are looser than others), and if the cone, battery or base has or doesn't have air channels. Even the drip tip ID matters to a lesser extent- I have a very restrictive drip tip from a Tobeco Kayfun Lite Plus that could make for a harder than necessary draw if used on some atomizers.
I'd also like to have a couple 45 degree drip tip adaptors for when I'm laying on the couch watching TV. Decadent I know, but what the heck. Plus I'm short one Kanger PT2 drip tip. No idea what became of it but I strongly suspect my four legged companion, Zee the canine pocket rocket, has made off with it! Looks like I might as well bite the bullet and put in an order. Hope Sweet-Vapes' site is running faster than it was last night- man was it s l o w !!