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The hesitation is from a lean condition, and it happens 20 to 25 ft out. So, it could be the squirter duration may needs to be lengthened. Or it could be that the vacuum secondaries are starting in a bit too early. If tuning the squirter does not help, try a slightly stiffer secondary vacuum spring. These are all simple things that you should do at the track to get it right.

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Try a green accelerator pump cam, it has a good long pump shot. Try position #1 first, if it's still lean, use position #2 on the accelerator pump cam.
On my carb, I blocked the rear power valve, added the rear screw-in jet extentions, and a notched float to clear the extentions. I also got the quick-change fuel bowls. They make jet changes pretty simple.