I'm a little fuzzy on this jet thing.
In model A the jets are formed through a hole in polycarb and then are aimed at a corresponding divit. In b the jets are forced into the divit by a projection of copper tubing or other material. Is there a preference? Personally I would thing in A the wash from the central divits would force the other jets off there mark. While in B you'd be assured the water ended up in the right spot. Any comments?
Also has anyone tried placing 2 pumps inline to up the pressure? Fire trucks often have 2 pumps that can be switched from parallel to series. In parallel flow is high while pressure is low. But to shoot further they switch to series in order to up the pressure and shoot further.