Changing Trademark owner name at TM registry

Hi, My company recently acquired a popular brandname/trademark through a 'Sale of ownership in brand' agreement. My queries are: 1. The brandname had been registered with the TM registry office in Delhi. My company is a foreign entity with corporate office in Mumbai. Should we transfer the application to Registry office in Mumbai? 2. From research I found out that by submitting Form TM-23, one can apply for change in name of proprietor at the registry office. Is it required to attach a brand assignment deed along with the Form or will the signature of both parties on the form will suffice? Thanks.