rejeting a 250ex

[bens250ex]

i rejeted my 250ex today with a dyno jet kit i took the air box lid off and the baffle out.. i used the jet it said to use and i felt some power increses in some spots but in other spots i thought it felt like it lost???im stuned this is my 1st time to rejet and my dad and bro helped me...it runs good but i dont noe if i need to change the jet like go up a size or down....and my how do u noe which ones are bigger and which ones are smaller...these questions maybe kinda stupid but this is my first time to rejet...

[luvregals]

on my wifes 250 i put in a 105 main jet....left the stock slow jet.... drilled holes in the airlid put a old stocking on it with filter oil all over it... and left the stock filter....i put 2 1/2 turns on the air screw and half a turn more than stock on the idle screw...that **** hauls *** now...oh yeah..it has a big gun race series full kit...