Maybe a (used) Anthem Amp 2, hybrid 200 w/ch. I know it can drive 2 ohms, however you probably need a specialist class A totally solid state amp for that punishing load. But you know that already. Think long rows of bipolar transistors, and huge heatsinks, old school amps. Modern high end amps are hampered by needing to be adaptable to home theater, they dont really make the current diesels any more. Van Alstine makes a hybrid power amp that he can adapt for tough loads also I think.