Maybe you could give an example on how to 'abuse' Deflection, seeing as it is a 2 Minute CD still? Say for EC Kephess.
You abuse Deflection by being able to use it 50% more often than Saber Ward. Essentially, if you're sitting on Deflection with it recharged, you're wasted it (the same can be said of all tank CDs though). You abuse it by actually using it as much as possible (though this doesn't mean that you should use it on low damage phases). Keep in mind, Deflection isn't as massively game breaking as Resilience is; abusing the living hell out of it is something that every Shadow tank should try to do, but it's not nearly as requisite to the whole "amazing Shadow tank" concept as abusing the hell out of Resilience.