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jetting or needle problem?

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I have a 2006 KTM 250xc-w, and it runs great once in powerband. However, at lower RPMs, as a i roll on the throttle, it will ping. I happens more often when I am in too tall of a gear for my speed. As I open the throttle more, the pinging goes away.

Here are some details

-Idles fine (using a 40 pilot)

-runs great at mid to wide open throttle (even have some spooging which means I might be richer than need be? using a 160 main)

What can I do about this? I have tried adding octane booster to my gas, but it's not helping. Could it be needle position? Any ideas?

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