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Forgive me if I'm wrong in my assumptions. :)
Noximus,
I would suggest testing different on-page factors, such as kw density, titles, and body text. I'm no SEO expert, so this is how *I* try and improve my rankings. Same should go for allintext too. In my case, it's pretty much a trial and error case. I keep trying until I go up a notch. If I go down, switch it back, and try again. You can also try hunting for higher PR links, and eventually you should get a boost from those too. I hope this helps. :)