Awesome AoE, but somwehat lacking in the ST department. However, I'd suggest you don't use both teleport attacks at once, but rather one per spawn - that way you'll have one of them ready each spawn.
My Elec/SD Scrapper is r0xx0ring teh b0xx0rz of whatever she comes in contact with. Build Up -> Shield Charge/Lightning Rod (whichever one is up) -> Fireball. If anything is left standing, append -> Thunder Strike.
I'm using Fury Flechette's Moderate IO Build, and I'm almost finished witht he pieces I need. Even did pretty good running a Hess TF last night. 
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Biggest Troll on the forums? I'll give you a hint:
so tell me how you think that would play, with shield charge, and lightning rod to nice aoes back to back for openers?