701 with Coffman pipe

I have a square nose 701 with dual 38s that has protec head and coffman pipe other than that it is stock. Can’t seem to get the jetting correct. It is dead on take off then it clears right up. Anyone know what jetting I should be running as well as pop off pressure? I am running it at sea level.
 
wide open throttle from a dig and you get a bog its rich on the lows. if it dies its lean. Id use factory pipes jetting and go from there
 
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