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If this were my challenge I'd stop doing new domains, at least right now, and give Google a chance to sort out the existing situation.
I think your best bet is to leave it alone, generate some good, quality links to the domain you would like to be included and try for some long-tail searches, because the amount of popularity necessary to rank a new site with no history for anything major between now and then is out of reach for most people and businesses...
I agree the 3rd site is a bad idea just getting presure off the client. I will go out and link build and keep my fingers crossed.