Hi Chicimono,
With your energy problems, you are probably spamming shred too much. Go easier on it and prioritise keeping up the DoTs. This means you will have more downtime than you're used to but use that time to think about your next move (e.g. whether you should refresh Rip or Savage Roar next) and it should result in a dps gain.
Looking at your logs, it appears you are using blood talons (the instant cast heal proc) immediately after it appears. This would explain your relatively high Rake and Shred damage with low Rip damage.
My advice here is to hold onto the proc and u
