I think Mumbai is NOT a good place for astrologers. They are not so expert in my opinion, maybe there are some exceptions.
I have gone to a Nadi in Mumbai and did not find him impressive, somewhere downtown. There was a good female astrologer in the central area, sorry I forgot her name.
But anyway, the best Brighu Astrologer (like Nadi) is in Karoi Rajasthan
Brghu Pandita Nathulal
Village Karoi (Karoe)
40 KM From Bilwara
He has been mentioned in these forums before: site:indiadivine.org Bhrigu Pandit Nathu Lal - Google Search