Figure Skating - looking for tips

[Jayson]

I think your technique is fine. With the 5D3 you should be fine with the f/4 IS. My only suggestion would be to up the exposure and get closer to the ice (if that's possible). I think shooting at their level would be a better spot than up high. Shooting at f/4 as you have will yield pretty good blur if you are shooting toward the 200mm end and filling the frame with your subject. If you wanted to get creative, you could slow your shutter speed and do a little panning as your subject moves across the ice in front of you. I view ice skating the same as I would view photographing youth soccer. Get on their level and try to fill the frame as best you can. If you can't fill the frame, have the subject to one side of the frame to give a sense of motion for where they are moving in the frame.