When you say reading plugs - You are referring to a WOT test, correct? Insert plug, run WOT, pull plug and chop. I pulled the plug earlier just to see if it showed signs of severe lean (overheating) and it didn't. I've got an assortment of mains but not pilots - I just ordered the set you linked so I'll have a set of pilots (and spare mains).
Historically I've just upped the main until WOT performance dropped off. Say, 110 has a better top end than 105. 115 is the same as 110. I would keep one size larger than the best performing jet (115 in my example). I bought a case of NGKs for my YZ specifically for chopping but wound up never using them because I felt comfortable with my other method.
But I can always do a chop test. I may learn something. I just need to pick up some more plugs..
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