Shield extenders for buffer rather than Booster for tanking might be better - should be able to fit a large extender? (The Bustard can, I know that)

Is it pure EM damahe? That's something at least.

Alternatively how about a Noctis on hand to pull the cans out of the field with it's extended tractor range? Does the DOT occur on the whole grid or just within X KM of a point?

i.e. If you warp in at 100km do you still take damage?