Get rid of Drain and Erase and put Diversion and Manashift instead. Your tanks and healers will appreciate it.

As for hotbars, don't forget that there is such thing as the extended hotbar. I have mine set to show the same hotbar no matter the order it's pressed. Google extended hotbar setup if you'd like. :0

Skills like: Sleep, Freeze, and Surecast you can stick on your backest of Bars. You will use them very infrequently, but they should be placed. Everything else you should be able to fit on your main/extended hotbar.