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Are you absolutely 100% sure that those plugs at 5 and 6 are firing? Can you get at the power for the igniters to unplug them while the engine's running? If it runs worse, or dies, then that cylinder was firing.
You can also remove the igniter and test it using a new plug and a ground strap. Testing is key. Think of how much time and effort went to replacing all that perfectly good shit.
I've dealt with simultaneous seemingly-independent failures. It's rare but it happens. I've also dealt with a couple engines that were consistently wrong in how they reported misfires.
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