That's just one more item to add to the long list of why duals are "one carburetor too many!" It sounds like you really need even more pedal travel to accelerate smoothly, maybe with a second bellcrank somewhere in the linkage.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!