Out of 6 cards 4 will be use in a month, not fixed one. Once in while all cards will be used in once 2-3 months.780 is good score but loan amount will be reduced as compared to 800 plus points.
Btw out of 8 cards how many you use frequently?
780 score I was checked 6 month back after that I took one housing loan and 1personal loan. Still my loan eligibility is there for me to take as I need