On the new 1.5MB service, you *should* get 170-180Kb/s download and 25-30Kb/s upload.
What speed tests have you tried (if any). It could be the sites that you are downloading from arent fast enough.
What ftp sites are you trying, and have you tried several?
Try
www.dslzoneuk.net/speedtest.php - make sure you select your correct speed/plan.