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How do I know when MAIN jetting is off?

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I have an 02 YZ250F with a White Brothers R4 pipe and a PowerNow. I ride a lot of MX and I'd like a bit more power on WOT. It doesn't pop on decel or hang on idle, it revs all the to the rev limiter. The main is a 178, which is stock. I have a 180 and a 182 on order. How will I know if the jetting is too rich on the main?

Thanks

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If you get to rich on MJ it will miss at higher RPM's, and feel like you are hitting the rev. limiter, but to early. Lean on MJ will feel weak.

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