Google positioning ?

Hi,
Am really new to all this internet marketing, and trying to learn it all.

I created 5 autoblogs about 1.5 weeks ago. I indexed them all with google.

I created sitemaps, for them all and added them to google webmaster tools.

I added google analytics to all the sites to keep a check on them, for keywords etc.

Ive added "backlink cloud" plugin a day or 2 ago on all sites, and added social networking buttons yesterday.

Also been using wpunique on all 5 sites.

Now after 1.5 weeks, 2 of these sites are actually indexed. The other 3 are not, even though i indexed them at the same time.

And 1 of the sites, was at page 249 out of about 102000 sites for a keyword phrase. That was 2 days ago.
Then yesterday this same site was down to page 274 out of the 102000 sites for the same keyword phrase.
And today when i checked it, its not even in the top 1000 sites.

The only thing i can think i did, was i changed the keywords on the site a couple of days ago. I had 1 keywords phrase, the name of the site. And the other keywords were all single words. But after looking at other sites, and noticing that they all mainly had keywords phrases i decided to alter the single keywords, to about 6 or 7 keywords phrases all about the same sort of thing.

Could this changing the keywords of made my site drop from the page list i had 2 days ago ?
Or could something else be the problem ?

The site am talking about is the "Golds Gym Weights" one in my signature.

Would be extremely grateful for any advice on the 3 sites in my signature.

Thanks

Tum