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You should take a GPS and measure the top speed on a level road with no wind you get with the various jets. One or two of them among your 92, 95 and 98 ought to give you a better top speed which will tell you what range you ought to be going for.
And the 38 pilot can be washing the plug clean. Are you able to adjust the idle mixture screw using the idle drop method? If not then you're too rich on the pilot jet and would be better off switching back to the 34. If your pilot jet is flooding your cylinder with gas at idle it can throw a proper plug chop off.
Because by the looks of it the 95 or 92 are actually closer to the jets you want. In fact it looks like the 95 you're getting carbon build up on the metal edges. On mine when I have them tuned perfect metal has no carbon build up and looks like a dull even brown no black spots or build up.
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