On the date of migration of the Sāgnika Paṁcabrāhmaṇa (5 Brahmins) - 01

When exactly did the migration of the Sāgnika Paṁcabrāhmaṇa (the traditional 5 ancestors of Rāḍhi and Vārendra Bengali Brahmins) from Kolāñca / Kannauja / Kroḍāñca to Gauḍa / Gauḍāmaṇḍala (old Bengal*) take place?

The traditional time-frame of the migration as per ancient texts - there are 9 such distinct dates:

1. According to the vārendra kulapañji and Vācaspati miśra - 654 saka = 732 C.E.


2. According to the Dattavaṁśamālā - 804 saka = 882 AD

3. According to the author of Kāyastakaustubha - 814 saka = 892 AD

4. According to Kulārṇava - 854 saka = 932 AD

5. According to Sambandha nirṇaya pariśiṣṭhā - 864 saka = 942 AD

6. According to Rajendralal Mitra - 886 saka = 964 AD

7. According to the author of "Gaudey Brahman" - 954 saka = 1032 AD

8. According to the Bhaṭṭagrantha - 994 saka = 1072 AD

9. According to the kśitīṣvaṁśāvali - 999 saka = 1078 AD

Notes:
Saka Era : 78 C.E = 0 saka (For detail see here)
* Consisting of West Bengal and Islamic Bangladesh