Check the rail and frame fit and look for any burrs and other imperfections that might hang up the slide operation. Even a slight bit of rust can create problems.
What do you use to lube the rails? Rails like grease. If that's good and works well, then go to a lighter recoil spring.
After that, if you don't want to fool with it, I'll give you $201. for it.
If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen. ― Samuel Adams