If you want to be like the fabled frost mages, or people who only do a single combo and forgo the rest of their abilities you could make macro's cause macro's add time to when the next ability activates and you do less DMG and it scales worse the longer the fight you are in. I use 3 main hotbars for my abilities and even then I wouldn't fill them up to use them all for SAM at 70. Maybe try a completely different hotbar set-up and if you don't use a MMO style mouse try moving your movement keys to the center of the keyboard for hotkkeys to the left and right of your movement keys