Springers tend to be on the bite or not on the bite, when on the bite I haven't found that lighter leaders do any better "like it might in steelhead fishing", that said I tend to use 20 or 25 lb leader for most salmon fisheries, this also helps to deal with them fast if native or being chased by pesky sea lions.
I admit I have caught a number of large salmon on 10 line while searching for steelhead with spinners but I wouldn't call this practice my norm.