So, there's a few things.
My Garrosh Log: http://www.warcraftlogs.com/reports/DXCTyAP2fvRF7zbG#type=summary&source=7Your Garrosh Log: http://www.warcraftlogs.com/reports/dW1BzfrKR6pQk83h#type=summary&source=6Frost:-Your Blood Plague uptime is too low. As DW frost, you should be hanging around 85%, give or take 5%. In fact, at your haste, you should probably be even higher.
-You SHOULD be using BT, no matter what. If you don't want to deal with it, macroing Blood Tap is still superior to Runic Empowerment, because of how it interacts with AMS soaking.
-Comparing your frost logs to mine, your Pillar of Frost uptime is considerably lower. I'm not sure what version of Evil Eye you have, but mine was 42.21% compared to your 34.65%. Even with just an LFR Evil Eye, this is a bit low.
-You need to react to Killing Machine faster. Your KM uptime was 38.71%, whereas mine was 26.57%. If you fix this you will get a lot more damage out of Frost Strike, since your KM procs are getting overwritten.
-You hold RP far too long. You wasted an enormous amount of RP. In addition, you had half the casts of AMS as I did, resulting in even less RP. On top of that, your RP was so high during those AMSes that most of the RP was wasted.
Blood:-You should not be playing Runic Empowerment as blood. You should be using Blood Tap or Runic Empowerment. Generally Blood Tap is better.
-Why are you mastery and not dodge/parry? This isn't a trick question, both are viable. But I'd like to hear why.
-Why are you using Glyph of Festering Blood rather than something like Loud Horn or Glyph of Pestilence?
-Explain to me how you handle Death Strike usage, if you would.
Thanks.