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sorry another jetting question

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hey eddie, i have an 07 drz 400. last night I did the 3x3 mod and installed a dynojet kit as well as a k&n filter. it has the stock exhaust.I installed the dynojet needle with the clip in the 4th position and all the spacers and washers in place. I did not change the jetting as the dynojet kit called for a 136 and the stock main is a 142.5. I am riding at about 2300 above sea level and it is hot and dry. I did put in the extended idle screw and turned it 2.5 turns out. the pilot appears to be a 22.5. Now my question is this, should i be rejetting, and if so, why would i rejet to a smaller jet after opening up the air box. If you would, please recommend a jetting for me, as I am not convinced that the 142.5 is big enough either after trying to sift through everybody elses setup.

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