Woolf Spring has sear springs for O3's:
Springs for SPRINGFIELD Rifles & Shotguns
Unfortunately there is no spec so whether they are lighter, heavier about the same is anybody's guess. you could try calling them i suppose. They might even be able to wind something special.
Another thing you can do is totally strip the assembly. make sure everything is scrupulously clean, deburred and well but not over lubricated.
good luck!
Regards,
Jim