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OK, let try and clear this up: If the cats were working correctly, the O2 sensor ahead of the three way cat should be cycling on a sine wave like curve when the voltage is traced on a scope, while the sensor behind the cat should be drawing a nearly flat voltage trace line. When they are both cycling, it means the cat in between them is dead and unable to alter the exhaust gas to meet target.
As you are getting P0420 and 0430, it indicates that both your cats are dead (the OBD II manual for the car states it as "TWC conversion rate is too low").
If you are consistently "belching smoke" on start up, the oil has done in your cats. You need to find the source of that and fix it as just replacing these very expensive cats will not help you, the new ones will just die like the original ones did.
Good luck.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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