727 front clutch # springs vs front clutch restrictor size?

My trans as built has 12 springs in the front clutch setup, but the RMVB I have for it recommends 15. I'm not clear on the relationship between how the number of springs affects the 2-3 shift overlap vs the use of (or not using) a restrictor in the front clutch apply passage. The RMVB is supposed to not require any restrictor, FWIW.

Maybe it's a dumba$$ question, but I'll own it. grin

EDIT: It's got a 4.2 lever

Last edited by Brad_Haak; 07/22/22 11:44 AM.
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)

1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)