300 won't idle. Please help!!

[stemplin]

I have an 08 300 that won't idle and I'm about to pull my hair out.

I have searched and read through pages and pages of posts but still no solution.

I ride at 0-500 ft elevation with 70-100 degree temps most of the year.

My bike has the RB head and carb mods, Gnarly pipe, and Q stealth silencer. When I got the carb back from Ron, it was jetted pretty much dead on (178 main, 42 pilot) and ran like a top.

Over time it has gotten worse and will hardly idle now. Idle screw is completely bottomed against the spring to get any kind of idle. The choke, idle screw, and air screw seem to have very little effect at all. There is a bad flat spot at around 1/4 to 1/2 throttle. I have to really push through the flat spot to get it on the pipe and gas mileage has gone to crap. 20-25 miles and I'm switching to reserve. The bike spooges like crazy.

I've tried pretty much everything I've read in the posts that I've searched and nothing seems to have helped so far.

I raised the needle clip a notch with little effect.
Brand new NGK BR8EG plug
Clean air filter
disassembled and cleaned Powervalve assembly
Carb is spotless, cleaned multiple times
Float height seems ok as I can lean bike either side with no fuel overflow
Re routed horizontal carb vents up and into the airbox
Brand new reed valves
brand new rubber boot between reeds and carb.

I don't suspect an air leak as the idle never races or anything.

If anyone has had these problems or knows anything else I can try, I'm all ears.

Thanks everyone.