The Talisman

[Arkcon]

TurinTurambar said:
"Is ECM III even going to help me?"

No. And keeping your ship at long range only gives you the distance penalty. Amass fleets that are larger than his, set strategy to short range or point blank, and hit them hard (most powerful weapons, not longest range or balanced resource cost).

Try to get the rest of the players to turn against him with an "its Us vs Them" mentality. And try to hit his planets that are sources of income to pay maintenance.