Looking forward to testing this out, will report back. As an aside, I use Dark Regeneration for most fights - I've been manually adding the following ability:
Any chance of baking this talent into the profile?

It's basically just a lightly modified version of your healthstone or mortal coil ability, I think.
Also, with T15, there's no shortened cooldown on Dark Soul, so no real benefit to saving Synapse Springs for Dark Soul pop. I've been adding "Use 10" to Malefic Grasp to pop Synapse Springs on cooldown, but that's pretty amateurish. Given that it's an on-use item, is there a better way to handle it?