Personally, I'd wire them for 4-ohms mono and wire them to the amp in bridged mode. There wouldn't be any significant difference in power, but you'd avoid any conflict between the subs' output due to difference between the left and right audio signals. Generally, subwoofers work best with a mono signal.
P.S. 400 watts RMS for a 600-watt RMS rated subwoofer is NOT an example of "severely underpowered".
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