It's SAO, do you have a comp hammer? If yes, then the hammer spring is really moot, you want it to function with any primer. You might get a 1/4 lb lighter with a lighter spring, not worth it in my mind. If not, then you should invest in a race hammer. It will dramatically improve your trigger pull feel and crispness.
I'm running 26lb main springs in my TSO's. I'm trying to get a heavier pull but the main spring only has a subtle effect. At least I can run any primer I want (including small rifle if needed).
Cheers,
Toby