On my DGV-5A on a 1200cc engine. I ran 45 and 50 idle jets feeding the primary and secondary throats. Another method to assit in diagnosing if the problem lies in the pump cct or idle cct is to test the following. a) Does the hesitation happen when you give the throttle a quick stab [this relies heavily on the pump cct to counter the sudden rush of air or b) does the hesitation occur on very slowly applying the thottle which relies more on the idle and progression ccts to counter the increased air moving through he venturi. Set the float level to the correct level as specified for your carby, no if or buts in a NA application. Lastly the pump cct lever has provision for two settings to adjust the arm ratio which alters the time taken to squirt the same volume of fuel.