I do a few other things when adding springs.
Smooth up the Hammer Spring Strut. They are stamped, and rough as a cob. Start with a file, and end up polishing with a buffer.
I clean up all the Pin Holes with "Quick Attach" drill bits (Turned By Hand).
I add shims to the Trigger and Hammer Dog. The Hammer Shims are a Real Pain to install or Reinstall. I now skip installing them.
A few other contact areas can be polished up. Do not go past slicking the parts up.
You can probably find an article doing a search for GP100 Trigger Job.
Look at You Tube Footage of GP100 Trigger Jobs, several is better. Some are a waste of time watching them. You can learn from others.

NOTE: You can slick up the Hammer Strut while waiting on your springs. That may help the feel.

Good Luck.

Bob