You're going for stam too early. You're way under expertise cap, you're probably getting parried all the time. That will help a lot. Also, as a warrior you should use the % block meta (Eternal Primal Diamond), it gives slightly better mitigation with shield block.
So ya... get more expertise, that should allow you to get to 60 rage faster and keep sblock up faster. That and just more ilevel should help.
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