glock 19?
clean and replace recoil spring every three years whether it needs it or not.
That sound a little excessive. As long as one doesn't lock the slide open(like after shooting the last round) and let it sit for a long time, I don't see that is necessary.
OP only has about 1,500 rounds, that doesn't sound like a lot of rounds. Unless the firing spring is kept in half cocked 24/7, then maybe. Still it's not like those full cocked and locked where the spring is compressed all the way. Even that, people debate whether that matter or not.
