I have one which I know is really counterintuitive, but I can't help it. If I have a watch which runs fast, say 5 seconds a day, I'll set it a minute slow so that over 2 weeks it gets more accurate. Before it gets beyond being "right" and therefore starts getting less accurate I set it back to a minute slow. I do the same for slow watches, and set them fast so that they drop back to accuracy.
Somewhere deep down I am happy with a watch getting more accurate day by day, but I can't have the time drifting away from GMT. I realise that this means my watches are often less accurate than they could be. I could set the fast watch 30 seconds slow and let it run for two weeks to approx 30 seconds fast, never being worse than +/- 30s, but that second week would drive me nuts..