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03 CRF450 running ragged at WOT

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I've got a 450 that runs great most of the time, the previous owner put a FMF Ti4 and powerbomb header on it. At WOT it runs ragged with some mild popping on decel, I pulled out the 170 main jet and put in a 175 and it really didn't make a lot of difference. To me it seems going to a 180 main jet seems a bit big. Anyone got some thoughts? As far as I can tell the motor is stock other than the header and muffler and it's near sea level. To me it still seems lean at WOT but I'm not sure.

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