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I'd take a needle-nosed plier and put a bend in each leg of the trigger return spring to accomplish the same thing and keep both legs attached.
Secondly, I'd leave the hammer spring alone. A lighter spring is going to increase lock time and might open your groups up as much or more than the heavy, creepy trigger.
If you've got creep, get a good smith to polish up your engagement surfaces properly, which will lighten up that trigger. You'll then have a great trigger that will enable you to, if you wish to pursue this accuracy thing further, actually put a heavier hammer spring on. That's the way to go.