Trevor loves holden.
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Not reading any faults, probably needs to plug it in and see which bank is playing up. My car is alloy Tec it has plug leads lol. Should of said VE. Anyway good luck with it.I'd be looking at the injectors. Cats work by heat but get them to hot and they can melt the guts out of em. The PCM monitors how the cats are working via the O2 sensors. Seeing as you have covered the ignition system fairly well the most likely issue is on the fuel side. A clogged or leaking injector could well be the cause.
A simple test would be to swap the injectors over to the other bank and then see if the fault moves with them.