Try some different ammo. You have nothing to lose, so mix it up some and see what happens.
Consider handing it to an experienced 1911 shooter. Worst case? Nothing changes. In any case, a firm grip matters.
As previously noted, try some different mags. If you shoot at a place with rental guns, see if they will let you borrow some different ones from the rental 1911s. It never hurts to ask anyway.
MSgt, USAF, Retired
NRA Life Member
The hardest thing to explain is the glaringly evident which everybody had decided not to see. - Ayn Rand