Have you adjusted the low end needle? Throttle transition is adjusted using the low end needle. The needle is opposite your main needle and is adjusted with a small flat bladed screw driver. Run you engine up to warm it up and blow out all the left over fuel. bring it down to just above idle. Pinch the fuel line. If the rpm's pick up, she's too rich, if the rpm's go down or she quit's the low end is too lean. Turn it clockwise to lean, counter-clockwise to richen.