I've been looking around my logs to look for areas where I can improve my dps. One of the things I've noticed (in game) is that I tend to pop shadow dance too early ( not pooling enough) . However in my logs I also noticed that I'm also capping energy and combo points a lot. What is an acceptable amount of resource waste for sub? Is there anything else I've not noticed in my logs that might help me improve my dps. 
I've been trying to reduce the amount of backstabs I cast during encounters which helped my dps quite a bit ( noticed a lot of the higher parsing sub rogues had less than half my bs casts)
 
https://www.warcraftlogs.com/rankings/character/21629426/latest/

So with combat being the dominant spec most of this tier, I have been sort of neglecting assassination(still hop into sub every now and then) and because of that I have come across a problem with trying to pick it back up: When should I pool energy, how many CP and Anticipation charges should I be at before casting an envenom, and the biggest thing is when should I stop pooling energy/CP and start spamming mutilate and envenom whenever possible?

Does anyone else lose the ability to gain energy or hit at all when attacking Evermaw out of bounds when fatigue starts to build (drain?)?  Is this a bug, or is it Blizzard's intent to emasculate rogues against Maw?