Changing the mainspring will change the recoil characteristics. Two things slow the slide down, the recoil spring and the mainspring. Standard mainspring in most 1911's is 23 lbs. Get a mainspring calibration pack from Brownells that comes with 19,20,21 lb springs and try them out. Going to a weaker mainspring will speed the slide up but reduce muzzle flip. What you perceive as recoil may be less, not greater.
If you go all the way down to a 19lb mainspring, increase the recoil spring to 17 lbs. many of the 1911 experts recomend this combo.
Another factor is the radius on the bottom of the firing pin stop. A whole nother story.
Play around, have fun, try different spring combinations and see what works for you. Springs are cheap and easy to replace and no permanent change to your Ruger so why not find out what you and your gun like?