Oh dear, I bet that comes as a shock!

A couple of questions, have you spoken to EBC's tech people?

Uneven pad wear (radial, longitudinal or in/out) such as what you have is usually the result of a poorly located (ie sticking) piston, or calipers that are not moving freely. It usually means failure of the pads due to exceeding the friction/temp curve by reducing the face (as if it was under spec'd).

Did you check/lubricate/clean these when you changed the pads?

Pushing a longitudinally or radially tapered brake pad against its rotor, a brake piston will "cock," moving off-centre in its bore in the caliper. Cocking creates a greater volume for fluid in the caliper which may explain your spongy pedal.

I have had my pads installed by an EBC supplier rather than DIY and have done significant miles without this sort of issue.....

I would be interested to hear their input when you return them.

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