The high racing idle is because a 32 pilot is too lean for a 250, and the idle screw will be wound in too far to compensate for the rich condition the needle is causing. Basically you will have lifted the slide a lot with the idle screw to the extent that the needle is actually sitting on the first taper at idle. It then makes it very inconsistant and the air screw will have little effect.
For most the needles you read about they can be ordered through OEM dealerships respectively. Suzuki/Ktm/Yamaha.
In my 2013 EC250R I settled on 40 NEDW#2 175
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