Previously i used the normal BOINC client to run Seti@home, it took me 14,955.72 seconds and i got 54.16 credits. Now i use a enhanced client, and i can do 1 task in 5,757.13 seconds but i get only 14.46 credits. Why do i get only 1/4 of the credits i got before, i'm doing way more in the same time! An awnser would be appreciated...

boincstats.com is a site just for showing how much credits you have earned for a range of different projects. For questions regarding how much credits you are getting for a task of a specific project, you should visit the fora of that project. For seti : http://setiathome.berkeley.edu/forum_index.php

There are different types of WUs at SETI. The crunching time and the credits depends on the AR (Angle Range) at which is was recorded from the telescope.