The springs in your RRA trigger are already lighter than the standard springs in your stock triggers Kimber. Clipping the lightweight RRA hammer spring could very well lead to reliability issues, since you would be removing the extra margin of power necessary to *reliably* ignite all but the softest primers. The RRA springs have been specifically matched to the trigger, and they don't need to get any lighter. For what it's worth I tried a set of very light JP springs in one of my RRA two-stage triggers for experimentation purposes, and reliability went right into the toilet.
As was stated above the best way to clean up your RRA two-stage is to *GENTLY* polish the engagement surfaces. Don't get medieval on it-less is more in this case-particularly if you get carried away and start to actually remove material.
Another quick and painless thing to do is to carefully secure your hammer and trigger pins in a drill chuck and then spin them lightly against a brillo pad to gently smooth them out and knock down any burrs. You
don't want to spin them so hard that you strip away the anodizing. After doing one side of the pin flip it around to do the other side-then repeat with the second pin. You will be amazed at how smooth the surfaces will feel after you're done. This will translate into less hammer/trigger rotational friction, which will lend itself to smoother operation.
With a little bit of effort you can make your RRA two-stage glass rod crisp, without having to resort to cutting