I would adjust the Pump cct duration and nothing else at this stage. 1 thing at a time.. Basically all the pump cct does is to fill the gap between idle and progression /main cct. The pump cct compensates for the sudden change in air flow as the butterfly is opened and the rush of air [lean condition] starts to move. The pump cct tries to level out the trough [see diagram] just after idle
As you probably already know, you only want enough fuel [correct ratio of Air/fuel] and for the minumum time required. By then the progression & main ccts should have caught up and start to meter fuel.

If you haven't seem this chart before, its very handy for a visual of whats going on.