Its strange as all the symptoms you name are typical for a lean condition. Surging is typically as well as high idle or an idle hang.
Go back to the 42 pilot jet and try to set the idle as low as possible as Jakobi suggested. Warm the motor up, dont let it idle, drive the bike a few minutes. Then turn the idle set screw until the idle is approximately 4 to 5 hundred RPM's too high. Let it idle high and close the air screw until it bottoms, no froce here. Turn the idle screw counter clockwise for a half turn, let the motor settle for 15 seconds. 15 seconds is a long time when you are waiting, so please be patient.
Turn the air screw quarter turns out and let the engine settle for 15 seconds every time you turn the air screw. Repeat this until you have reached the highest rpm, then turn the idle set screw out until the idle is low. Remember, the lowest idle would be best.
If you have turned the air screw less than one turn to achieve the highest rpm your pilot jet is too small. If you turned the air screw more than 2.75 turns out to achieve highest rpm your pilot jet is too rich.
Good luck!
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