You definitely need a new spring in the aluminum base mag; that one is just not right- may even be the wrong spring entirely. One can make an upper spring guide from a 9mm case.
It does sound like your hold open spring is still a little strong.
I believe you may need a new recoil spring in your 1911 also; and the mag springs may be weak too, causing the hold open malfunction.
Keep up the good posts.
