One thing I did on mine was frankenslotted Mind Link with different sets' Def/Recharges to get it close to perma. I think the way mine is right now I'm off by a few seconds but the defense worked out better in mine. CT: Offensive could probably be dropped for almost anything else. I never noticed it really helping much, even at earlier levels. Your build reminds me I keep forgetting to respec so I can get Aid Self (thanks for reminder #451... perhaps it will light a fire to remember finally). Mental Blast I don't know much about because I tend to stick to the stabby mcstabyourface powers on mine.
The IOs you have I didn't pay much attention to because it is late her and the sleepies are kicking in, but I did want to post something of a reply so you didn't feel left hanging completely. Happy toxic stabbing out there!