What other mods have you done? You may need to change your pilot jet as well, or try adjusting the pilot screw and see if it changes your hesitation.
The random 'blip' at WOT will be harder to diagnose, but start with above and see where you are.
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ASE Master and Toyota Master Diagnostic Certified
Buggy Building Trainee
'04 Dazon Raider 150 'modded'
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