Welcome to the Forum!
If you are planning on using it for hunting,, I have to ask what's wrong with the factory spring? You want to have a dependable spring,, and not a "too light" one where a light strike might cause you to miss a trophy! I own a few Redhawks, & a Super Redhawk,, and I've left all of mine factory stock.
Now,, if you want a smoother action,, have a gunsmith clean up the action a bit.