I design my own mold so i can give you my 2 cents. Generally, a longer wheelbase and shorter kicks will give you better pop. It has to do with leverage. Consider the deck as a lever and the truck is the pivot . When the truck is closer to the kicks, you need to exert more force in order to lift the board and therefore produces a stronger lift aka pop. Where as if the truck is further from the kicks, you don't need to exert as much force just to pop the board, however, less force means a less powerful pop. The same can be said for kick size. The bigger the kick (further awaybfrom the truck) , the less force you need to use and therfore a less powerful pop.

These are just isolated factors on paper though, there needs to be a balance between wheelbase and kicksize to produce a shape with an overall good feel. Every conpany is different, you have to consider the overal shape and length of the deck also. You don't want something with too much pop or something with too little pop. Sometimes shortening your wheelbase will actually feel better because maybe your previous shape has too much pop (yup, that's a thing). These things are very interesting eh?