I had this same exact problem.....airhorn gasket weeping fuel. Sent the airhorn to Cliff for straightening....got it back, same weepage problem.....lowered the float, leakage went away but a very nice stumble at tip-in developed.
Float was set too low creating a lean condition. Set the float to 9/32....no leaks, no stumble. I run 5-1/2 psi fuel pressure. Problem solved.
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"XE cam basher" 
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