Try kanthal 28ga,7 wraps,2mm and put it and spread it on the deck as much cotton as possible.That works very nice for me.12,5W - 13W.a
Whoops I forgot to mention that the very first thing I put in the berserker was a copy of my doggy style build so I could do a direct comparison. 28g kanthal, 7 wraps, 2mm contact coil vaping between 10-13w, and it wasn't that impressive. The flavor seemed a little worse than the doggy so I changed over to the clapton pretty quickly.
That's what I use in my Berserker except I use SS wire.
Maybe I'll try that next time instead of kanthal. Is your coil contact or spaced?