It should not be this hard. I'd try a #8. My 250 runs perfect with a JD Blue and a #7, and a 300 is a bigger pump with a bigger signature. It fixed a couple 300s here in the past, one in NY state so approx 0 - 1000'.
While the slide cutaway is described as affecting the same range as the needle straight dia., from experience it is a bit more broad, overlapping the low and mid more.
FWIW, If you send the carb to Ron for his mod, one thing he does is cut your slide leaner.
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