Remember, this is peer 2 peer...
Total Uploads for all people is equal to total downloads. If you constantly download more than you upload, you're leeching your ratio. This is a usual behavior to first upload more than download. You have to wait some times to have a higher queue value (and begin to have some good credits from other clients).
By the way, I don"t think there is really important difference between eMule/lMule/xMule/aMule.