Recoil spring is a little light.
On a 1911 (Just hear me out), the recoil spring works with the main spring to have an afffect on felt recoil. The recoil spring is designed to push the slide forward, and to help retard the movement backwards, but it does not do the work alone.
Suggestion would be to replace the recoil spring and the spring for the trigger when shooting upper power loaded rounds. More resistance should reduce the felt recoil.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)