Most Kyosho front springs are 45mm long.
My spring tester at work and my Losi shock tool both tell me that the light green springs are stiffer than the kit silvers.
There is no need for a dark green front, the only place I use the light green #75 spring is on carpet and then very rarely!!!
I almost exclusively run silver fronts on both the RB5 and ZX5-SP now, sometimes I run silvers with 1.5 coils cut off to give more spring stiffness but maintain the spring rate (same reason why some of the Losi boys run cut silvers on the front of the XX4).
I have always considered that the springs / damping are there to deal with the surface, the weight distribution of a car the handling balance and the geometry to tune ....... with that in mind I can't imagine why you'd want to run anything stiffer than a silver anyway!
it'd be really interesting to see your set-up and a description of the surface / track.
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