Well, a 23# recoil spring in a 9mm 1911 is crazy. I can't believe that's what is in your gun. Someone must have gotten a wire crossed. Does he mean a 23# mainspring?

If you've tried it with five or six rounds in the mag and get the same results then I'd think you have something else going on besides mag problems, but I have no idea what - maybe it is a disconnector problem? Be interested to know what you find out.