holley 4150 tune,one issue

new 4150 street hp carb.runs great otb.my only issue is in park at idle if i jab the throttle fast it will hesitate a bit.im pretty sure its a pump shot issue.i get gas as soon as i hit the throttle so im sure the adjustment is good,im thinking of going up on on squirter size.im i going in the right direction?float is set to just dribble out the hole.timing is set at 38.deg.with vac.adv.not in use.chrome ign. box.under load going down the road when and full throttle is applied there is no hesitation.