Carb mixture screw adjustment.

I have a 1200 k2' I have a venom exhaust, it runs a bit lumpy under 3000 rpm, I have set both outer carbs at 5 turns out which has greatly improved it, should I try and struggle to do centre carbs or leave as, I don't know what they are set at. Any help appreciated.

First of all set them all the same, I adjust them by taking apart a 4 in 1 screw driver and hold just the flat head bit and spinning them.
I'm pretty sure they are supposed to be set 2 turns to 4 turns if it runs better further then that, your slow speed jet is too small. Could also happen if your intake air boots are cracked.