Help with S&B Tactician Build

While researching the expansion I came across a document full of builds by user Dikkie. The Tactician build below interested me:

http://www.grimtools.com/calc/bVAGk1ND

A few questions I had:

Why does he go for Conviction instead of Bulwark for the exclusive skill? I noticed that the Octavius gear has +3 Conviction, but wouldn’t Bulwark make more sense?

What do you guys think of Forcewave with a shield build (untransmutted with the cooldown)? It seems like a really powerful skill if wearing the Octavious set.

Would I be better off just focusing skill points on Blitz until I obtain some good Forcewave gear? I noticed that Blitz hits with weapon and shield while Forcewave just hita with the shield.

Any changes/ctitiques in particular?

Thanks for the help.