[jhv48]

Things to check:

1. Make sure your secondary squirters are shooting as soon as the secondaries begin to move, if your carb has mechanical secondaries

2. Adjusting the idle air screws slightly rich will ease the transition from idle to primary circuit, but if you are experiencing a slight hesitation upon flooring the throttle, that won't effect it.

3. You are probably experiencing a brief lean condition. Try a lighter accellerator pump spring if using a vac. secondary.

4. You've done everything else that is recommended.