I'm not sure how anyone would know which springs to tell you to change to in this imaginary overlap scenario? Every combo is different depending on the parts/clearances you use will require different springs for shift timing.

If 2/3 is overlapping, then the front clutch is coming on faster then the 2nd gear band is releasing. The longer the two clutches overlap, the more drag, heat, friction, power loss there is. If the front drum is already applying quick, then releasing the intermediate band quick is the best solution to minimize the total shift event time right?

Adding a restriction to apply the front clutch pack slower just makes for longer/softer overlap and mushy ET robbing shifts. The reason the shift kit manufactures do it that way, is because it's cheaper to give you an orifice to install then a set of springs.