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If the hesitation occurs when you suddenly open the throttle then the problem may be the pump-jets.
But if it happens as you pull away from idle, or when you open the throttle gently then the problem lies elsewhere, in fact if it's masked by opening the throttle quickly then it's not the pump jets.
If so I'd experiment with a leaner idle jet. A rich idle jet can definitely cause a stumble off-idle.
Going to 34mm venturis will probably increase ultimate horsepower - good for going racing etc, but won't help driveability around town and certainly won't help the stumble. Alfa themselves actually reduced the inlet port diameter when they built the GTA because it increased the inlet gas velocity.
-Richard
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