Hmmmm... I am a 306 user also and I have gone almost exclusively to cisco (avid vaper) debridged 1.5 and 2.0 ohmers (on joye ego).
I used to get the cisco 1.8 ohmers, with the bridge and wick, and picked the wick out... and still have a bunch of those and still use them but... the debridged atties seem to give more vapor (and, of course, it means I only get 2-3 hits per drop on the 1.5 ohmers).
But, as someone suggested, try some of this and some of that and see what works best for you.
Also.. as far as what ohm atties you use... it all depends on what voltage you are
vaping at. The joye ego is regulated 3.4 volts so lower resistance atties are more appropriate. If you are using higher voltage then you probably want higher resistance atties.
Yeah, cisco sells 1.5 ohms, 2.0, 2.5, 3.0 and maybe higher... and this is all for what voltage you are vaping at.