[ENCOSEARRALIA]

AsslaamUAlaikum
Actually we have had this discussion for days with our Tajweed teacher. She is an excellent Qaria, pakistani origin but born and raised in Saudia. She has got the Tajweed degree from university of Riyadh. Her list of teachers include Qari Fateh Mohammad (the legend in Tajweed). Actually she was the correcting the Tajweed of teachers of certain Madrassas in lahore. One of the controversies was the pronounciation of Dhaad, so much so that the Qari Hazrat protested and there was a big howl over this issue. Fatawas were taken from Jamia Ashrafia from Madaris of karachi etc.
The true madhab in this pronounciation is that it should not resemble a Zhaa or a Daa. Dhaad has its own makhraj and should be pronounced from that. Now the issue in pakistan is that as this letter is difficult to pronounce by the Ajmis they keep it close to Zhaa which is easier to utter. The Ghayr Muqallid however prefer to keep it closer to Daa(following the Saudi prounciation which is actually not Dhaa). Well this is basically the situation here. Wassalaam