Not Ranked
It sure sounds like a fuel/heat realted issue to me. When you are cruising along, the fuel is moving through the lines quick enough so it doesn't have a chance to heat up or boil. I would try and isolate the fuel line from any possible heat source.
The only other possibility I can think of is some debris in the carb bowl that once you decellerate or lift off the gas it blocks the fuel from leaving the carb.
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