It seems like your goal is to perma energize and soul drain, which is ok. I think you can take the spiritual alpha slot into account, which allows some of your IO set bonuses to go to defense, rather than just recharge alone. It would be pretty good if you can bring your s/l/e/ne defense to mid 30s and stack it with darkest night. I think with both energize and power sink, your endurance should be fine, so it is not necessary to use impervium armor in your resistance toggles, maybe use reactive armors if you want some defense.
I have a DM/Elec sitting in his 30's, and want to know if I should finish him off...On the high end is this investment worth it?
Anyone have experience with it?