I personally don't think rotations are good for tanks and you should mainly focus on your enmity combo which is in your rotation and use the rest as and when you can or need it. Also when doing your enmity combo switch targets every now and then to get a hit on other marked mobs and not just 1, that'll cement aggro on that mob and prevent the healer from pulling hate or at least more than just leaving it or flash spam. If the mob gets away, provoke it off them and shield lob to get a bit of enmity back so that it comes back to you and then you can work on keeping that aggro on you.