I think everyone here needs to remember that in our application...the tripples are being used as a performance upgrade. When these carbs were used in OEM applications (Alfas, Fiats, etc) in Italy, they were choked down quite a bit. Like a 2litre Alfa eunning 2X 40DCOM with 28mm chokes. That is a 28mm choke on a 500cc cylinder!! There was almost no hesitation on these motors due to the high velocity of the air in the carb. In our case, to optimize HP in our motors....we run 30 or 32mm chokes on a 2.4litre or 32-34mm chokes on a 2.8litre. That is a 30mm choke on a 400cc cylinder. It WILL hesitate at lower RPM, and there is nothing you can do about it...short of creating a way too rich progression mixture or way too rich accell circuit stream. It is simple physics. I have the same issue and I am using a 33mm choke, that is 33mm choking down 466cc. The car screams like a banshee after 2500rpm, but try to nail it below that and it falls flat on its face. There was and old saying in racing many years ago.."Squeeze on throttle, Squeeze on brakes" If you drive a triple carbed Z that is tuned for performance, you have to drive it this way...IE like a race car...be gentle with the throttle until you get the RPM up into the working range for your exact carb / cam selection and setup, then you can nail it.