I'll run 25 ft on the outside and 12 up the middle to start.
If the c/rigger fires more than the outside, I'll tighten the outside length, and/or change to the same combo on the center rod.
Anyone ever run all the same flasher/fly combos on all the riggers?
We have trying to simulate a feeding school of salmon, and have had good luck do so, not all the time, but it has worked very well in the past.