Can I Stack % of Energy Shield as additional Stun Threshold

I'm running a CI build and naturally took Asceticism.
That's 30% of my Energy Shield as Stun Threshold, then I have Self Mortification and Eldritch Will (plus a couple other notables), which state "Gain 20% of maximum Energy Shield as additional Stun Threshold" -- do these effects work in conjunction with Asceticism and each other? Or am I wasting some points to spec into both of these?

I know there's already a thread asking, but please, please fix stun threshold on the character page.