Domain change

[diagurzula]

I changed my domain name sometime back. I did 301 redirect and some other things as per Google’s guidelines to retain my page rank. However, this domain change drastically impacted my position in Google. I used to rank 1 for some keywords but now I rank really bad. It has been more than a month and nothing seems to have happened for the better. And as far as Yahoo is concerned, I seem to have vanished from there. Thankfully, nothing has changed on Bing. What do I do in such a scenario? My Google position matters the most to me.