You are going to hear this many times... but your upgrades as a gold flying hub to hub are going to be in the low single digit percentages especially on cheap economy fares. For perspective as a 1K I usually have to burn an instrument if I want to secure an upgrade into SFO and even then I often dont get it. There are just that many high elites moving in and out of that airport, Most the time you can Global Services sitting in coach... Expect the upgrade list to be 50+ deep and most the plane to be in group 1/2. Really I wouldn't spend much time worrying about it, pick your E+ seat and that about all you can do, maybe you will win the lottery one day.