Cyanix

You might benefit from a higher uptime on garrotte/ rupt on several fights. Elisande and Gul'dan are particulary bad as far as uptimes are concerned. This might hint that you dont have much experience on these fights. With practice, you'll learn when to apply your bleeds to prevent downtime (ie: during Gul'dan's storm). As for envenom damage, well, it scales with mastery, and you're not that geared either :D