I don't have a lot of experience with Rogues, but being Outlaw I'm wondering whether removing one of the Ele Force chants and replacing with Landslide would be beneficial. Double Ele would be awesome with Assis Rogue but with Outlaw I'm thinking the extra AP would come in handy, especially that it procs quite frequently from what I recall.
Also if you can afford it throw the new Legion neck chant on (the Satyr one). It procs almost first up every time and hits quite hard depending on your AP.
You may also be able to look for some more DPS orientated trinkets. If you have Defending Champion or even the Void Tendrils for wPvP. And if you have the time to grind it maybe an Arena Trinket for the absorb.
Last thing is maybe the leg patch, the Pandaria leg patch scales slightly better than the Icescale you have.
That's my comments. You are very well geared btw. These suggested changes will only increase your stats ever so slightly but I guess that's twinking, every little bit counts