Ret OS... Which trinks to use?

[Rio]

Currently I'm running Holy MS with a Ret OS. Even though I don't use my OS often, I still like to min/max as much as possible and keep up to date with all Retribution changes. With that said, I've just nabbed an Apparatus of Khaz(whatever). However I'm currently using DMC: Hurricane and Impatience of Youth... And I'm stuck trying to decide which to dump for AoK.

Suggestions?

*Also* -- When's the best time to use Apparatus? Obviously when it's at 5 stacks and available, but should I wait to pop potion, GoAK, Zealotry and AW until I get all 5 stacks?

Thanks in advance ~

[Soundeffects]

This should be all you need.

http://www.mmo-champion.com/threads/933474-Ret-Trinket-ratings-estimation-Firelands-4.2

[Deleted]

I'm using License to slay and Apparatus at the moment, but i'm a "haste abuser" so I'll use AoK together with zealotry but not with Avenging Wrath to not waste 3s CD on crusader strike when Apparatus is active

[Tankercow]

The justice trinket (License to Slay) is a pretty nice choice from my experience.