09 with fmf ti powercore jetting

Just installed a fmf ti powercore slip on and I'm having trouble getting the jetting clean. I went to a 165 on the main. When the throttle is held 1/4-1/2 throttle steady its very broken up with popping and backfires when you let off. Where should i go from here with the jetting. I'm not very experienced with jetting yet. thanks!

More fuel via fuel screw or larger pilot...

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