1. You're going to drop Eye doing that, instead just use Eye in place of Block.

2. Fracture is a DPS gain as long as you get the full ticks. The only time you shouldn't keep it up is if the boss is going go immune before it's finished. It is your second highest potency skill and all it does is push Fell Cleave back 1 GCD, it doesn't just magically get rid of FCs. Saw people spewing that Fracture is a DPS loss @ full uptime on Reddit for whatever reason so I thought I'd just throw that out there. If anyone out there has some actual math regarding Fracture as a DPS loss I'd be willing to be proved wrong but I've yet to see it.

3. If you're getting more than 2 Berserks over the fight then it's better to use IR on CD, but this largely depends on the fight. Generally you want to save Infuriate for 3x FC but that also depends on the fight. If you don't want to think about it too hard just save both for 3x FC.