i have a pt111 mil pro i'd be willing to sell you. need the money to upgrade my 1911... i'm in westerville.
You are actually causing premature wear on your magazine springs by doing so. Magazine springs wear out from cycling between compressed and not compressed not from simply being compressed. Think of a wire coat hanger. Flex the coat hanger and hold it flexed. How long do you think it would take for that coat hanger to break where it is flexed? Not take that coat hanger and bend it back and forth repeatedly. It first heats up and then breaks after several cycles.
It's that same with magazine springs. Since you aren't loading the magazines to full capacity, you are having to reload the magazines more often to shoot the same number of rounds, hence wearing the springs earlier than if they were fully loaded.