I think the 40 PJ is fine... a 38 is too lean for most conditions and the MJ seems in the ballpark.
So, I'd look to the needle and possibly a MJ adjustment.
Some of the GG needles I have seen vary quite a bit in the middle, can't remember the # but one was fairly fat and thinned down quickly in it's taper.
Might be what you have, as you open the throttle it dumps too much fuel too quickly.
Some wide open plug chops should tell you how spot on the MJ is, if it's close then the needle is where I would concentrate my efforts.
Drop it and see if there's and improvement...if so your on the right track.
Hope that helps.
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