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If you're running a power valve in the primaries, open up the PVCRs for the extra fuel at WOT. That is what they are there for.

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Yep, thats what I did with mine and it has worked great.

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How to tell how big they need to be opened up?

I have the same problem with my carb

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If you have a wide ban on the car jet the part throttle down until you like it and then do the math on the diameter of the jet change size on the jets and then measure the Power Valve Restriction Channel(PVRC) inside diameter and open it up enough to make up the difference in same AFR ratio as the jet change made when you had the WOT AFR set at before changing the primary jet sizes