Step 1: Stack Skill Speed
Step 2: Tell WHM to get lost because Selene is better than they are
Step 3: Win
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Yeah, it depends on an encounter by encounter basis, however in an ideal situation, you want to use it as often as possible as not to waste the extra stacks of Wrath.
Though at every 35s you wouldn't waste too many as it takes 20s to get 5 stacks and if you make use of Infuriate every other DS then you'll only miss on out a few extra stacks.
Everything I've seen is 10 skill speed to .01 reduction. I can't say definitively, but based on HiirNoivr's earlier posts and how it looks like the mechanics work, the 30% will apply to the base value (2.5). This will put you at 1.75 GCD. Start stacking skill speed and you're going to likely end up with permanent (or close enough) damage reduction with Storm's Path and IB. You need two scholars I believe.
It's why this change is so huge. If you are going to max min, this change to Warriors has a significant impact to class composition of a raid.
You can cut about 6% off your GCD if you stack it on every piece you have.
The 30% likely applies multiplicatively. To get 100% uptime, you'd need to fit 9 GCDs in 6 seconds, which is a GCD time of 0.667 seconds. Assuming 100% uptime on Fey Light, that's 0.952 per GCD base, which is... let's see... something to the tune of 1889 skill speed. So yeah, that ain't gonna happen.