Frd, there is sure to be a drop in power cos two weeks ago, the whether was cool, so when u ride, the feeling is different from now cos these fews days is hot so abit " tang kui". Bike with jet kits will react differently due to weather conditions, so not to worry. Anyway u jus fix on ur factory kit right, did u bring it back to ur mech for re adjustments?? Cos setting is not a one time ting loh, i am sure u paid abt 300++ for tis setting so make sure the mech does a good job.