I get about 7-8k using the mangle,rake,mangle,mangle,rip sequence on target dummies. I got the vicious staff a couple of weeks back and that definitely made the most difference so far in damage. The key to sustaining over 10k is probably pooling energy, watching bleeds and shredding rather than mangling.

You probably mean Lifebloom rather than Wild Growth in the macro above. I have been looking at a bear form macro and think this might work well:

/castsequence reset=target Lacerate(Bear Form), Lacerate(Bear Form), Lacerate(Bear Form), Pulverize(Bear Form)
/cast Mangle(Bear Form)

Then manually managing faerie fire and other cooldowns. For aoe, something similar with swipe and thrash weaved in. It should get much simpler once 4.1 is released and swipe has a 3 second cooldown.