I'm thinking stone fist and invigorating drain are redundant in their CC potential. That and invigorating drain is so much better than stone fist (and according to the calculator cheaper). So removing stone fist would free up a spot. I recommend "executioner" because it does massive damage once the enemy is below half health, and it is a nice instant attack that will finish up your heavy attacks. Just after your regular attack gets logged as a heavy attack pop executioner and it will remove the animation portion of the heavy attack and give you a quick two hit combo. (any instant should work)
(edit: just saw the limitation of invigorating drain. If you chose to lose ID you could recoup it with green dragon blood).

Second I'm thinking that critical charge would be a better escape avoider than extending chains. It serves the same function but it does 5x as much damage because it always crits. With critical charge you actually want them to try to run away. (You can also use it to escape so long as there is someone to charge to in the direction you want to escape too..such as an enemy player closer to your group).

Just a few things I thought would be better, but it's your toon and your time.

(just thought about it but the knockback on your ultimate would provide the gap for another critical charge.)

Do what I did and drop bow for damage staff. I use my 2h for single combat and staff for mobs and absolutely own everything.