It's not that the E-compressor doubles your plates it's just that it makes 2 at a time, effectively it uses twice as much material to make 2 plates instead of 1.Am I misunderstanding the electric compressor? The nei recipe's show that it doubles the plates you get yet I still only get what I was getting with the normal compressor?
In other news... I would suggest everyone build an Electric Arc Furnace, ASAP.... Having the Electric Arc Furnace is the ONLY way to double your Meteoric Iron, Desh, and other planetary ore ingots. It's made starting the T2 production almost painless.