A couple of updates for you:
- Shuffle -- We're considering a test of removing the channel aspect of Shuffle. We think a channel mitigation ability is cool and different from other tanks, but it's problematic if Shuffle's short cooldown results in you spending all your time channeling it. That said, we might change our minds and make Shuffle a longer cooldown again.
- Mastery -- We're thinking about changing mastery to reduce the initial damage taken rather than the stagger periodic (again, if we keep the current design).