I've had duplicate guns before and still do. It seemed logical to me to have a fresh gun as a carry gun and a specific gun for practice. Until I realized that even though I have them set up the same way they are still different enough whether it be trigger feel or poi that I abandoned that idea and just use my pistols. I like carrying the gun I sweat on and cut my hands on and whatever else happened while shooting it.
I just do my 1,000 round break in with no cleaning or re-lubing. Springs are changed regularly and I clean my guns every time I shoot them and inspect them for any odd signs of wearing or part breakage. Overall I just feel more confident with the guns I shoot the most.