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08 crf450 bog crack to mid throttle

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I have a bog from crack to about 1/2 throttle,then runs normal crispy.It runs,just not crisp & lacks power but does have low end.Starts perfect 1 kick as always.This started after fresh rebuilt top end.I cleaned carb while motor was apart,prevenative.Rebuilt 08 with 02 piston & 06 head,stainless valves.Have pulled carb apart 2 more times,cleaning especially the pilot,no difference.Running fuel screw 1 3/4 out +- 1 or more,no big diff.Ran perfect at all elevations before bent intake valve.It seems to be worse at elevation,but once past 1/2 ish throttle it kicks in & runs great,like on the powerband of an old 2 stroke .I ride sierra nevadas high elevation.A buddy had a mechanic put a 05 piston in his 02 & he had hard starting & bogging,then switched to a 05 cam,& that fixed it,at least that's what the mech said??Any ideas?thanks

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