QuickFuel is still a Holley design style carb. The issue is most likely the vents on the secondary bowls. Under hard de-acceleration, the fuel sloshes out of the vent opening into the throats of the carb and stalls the engine. Center pivot bowls are an improvement on this; adding "whistles" to the vents will help some but it remains a constant issue on this style carb.
Adding "road race" floats to the carb will help considerably for the cornering issues.
I fought it for years on my setup and finally went to a weber system. Got rid of the stalling issue - but found twenty other issues
Paul