Nice pick, Rad Blast would have been godly if i24 ever made it live. I would stick with Scorpion Shield. Clarion Radial would only keep you at 36% def for 22.5 secs, then you would be around 29% for 22.5 secs, 26% for 45 secs and 23.5% for 30 seconds. I would build for softcap in S/L/E and go for Clarion Core since it will provide some status resistance for the whole 2 mins.
Some of the IO slotting is odd. You will not have trouble hitting so all the def debuff IOs in Sleet is kind of a waste. Just recharge and end reduction is good enough. Have several Kismet IOs but not the most important one, +6% tohit unique. IMO the end cost of Focused Accuracy makes it worse than Tactics.
If i24 went live, this would be a combo worth tricking out with purples and pvp IOs... or Rad/Rad... or Kin/Rad... or Time/Rad. Almost anything/Rad.