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A good thread for knowing how to get the "fresh" robot to visit you is [webmasterworld.com...]
I have also seen a number of times especially with new sites, that the "fresh" robot pick it up in the beginning and index it for a week, and then dropps it, and wait for it to be index by the "full crawl" and get a stable position in the index.
What your saying seems to be exactly whats happened. My old site was deepcrawled, then the freshbot picked up the new site and that achieved a good PR. During the update though, Google seems to have rolled back to the last deep crawl which affected my rankings.
Just got to sit tight now, and wait - and damn thats hard!