You can sacrifice some of your Vitality in exchange for CC and CHD to get damage up, and some for All Resist. Also, make better red gems. You should easily be able to make some +200 strength gems. That alone will send your damage through the roof.
edit: I totally missed the weapon lacking a socket. Good catch, Shoqzie.
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edit: I totally missed the weapon lacking a socket. Good catch, Shoqzie.