Ditch the adapters? I'm a big adapter fan, especially for the KR.
For one thing, I've had a number of KR batteries and a mod that had draw problems - either too tight or too much air flow, for whatever reason my adapters all seem to have perfect draw.
Also, they help keep my devices clean. Any minor leakage from overfilling gets on the adapter, which is easy to take off, blow out, and wipe down - no juice in the batteries.
Any carto fits - sometimes you get a carto that sets a little higher or lower - it won't quite catch the threads because the connection is too low on the carto or if the connector is too high it can fail to connect - the adapters have that sliding connection post that adjusts itself and always provides a perfect connection.
And it protects my threads - with all kinds of atties I've had times where the threads seem off, jagged, or too tight. If I mess up the threads on my adapter, so what? If I jack the threads on my device, that is a problem.
Adapters rule. And there's also the part where you can use any atty on any mod - that's nice. Variety.