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Before going bonkers on complicated stuff, check the float height in your carb. Rule of thumb is, it should let fuel through when the arm on the float is parallel with the split between the carb body and bowl, and shut off if it's raised above that. If it's shutting off way early, you'll have a low fuel level in your bowl and will starve it during sustained open throttle events -- like riding on the highway.
My Bashan's carb had the float height whacked in such a way from the factory, and caused similar issues. "Adjustment" is typically as simple as just bending the little tab on the float that engages the valve slightly until it's about right.
You can bench test these by sticking a short length of tubing on the inlet and filling it with a small amount of water or, if you're paranoid, kerosene. That'll let you see at which position it shuts off or flows through.
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