10# is typical for the recoil spring. Could be upgraded to 11 or 9 depending on the ammo you are shooting. According to Wilson Combat, they run a 11# spring in their full sized 1911 9mm.
Mainspring/hammer spring standard is 23 lbs. I use 19 lbs and have had zero FFF malfunctions.
Springs are inexpensive - grab a few different weights and experiment.