Gents, I have two Colt XSE Lightweight Commanders. One in .45 and the other in .38 Super. My intention is to shoot +P out of both. Stock recoil spring for the .45 and .38 Super are 18lbs and 16lbs respectively. Should I bump these up a pound or two for each in order to shoot +P ammo? Also, I want to use a standard length guide rod in the .45. Can I just get one from Midway with a standard plug and install them? Thanks for your help in advance.