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How long and high is it in the air? Maybe it is possible you are up long and high enough to uncover the front jets in carb long enough to cause and issue. Maybe some sort of modified jet extensions are in order? Have you watched the fuel pressure to see what it is doing? I know that is easier said than done while driving a car in the air but might take a peak.

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Look at the highest angle you get the car up to, then add about thirty degrees for acceleration, maybe more. Look at a float bowl at that angle and you can see what is happening to the fuel. I bet the custom jet extensions will do it.