Difference didnot reduce between exchanges. Bit weird.
I have booked my 50% around 550 and will hold the remaining till 27-28 Jan, I would have the trailing stop loss means to set up a stop-loss and keep moving it based on the rise.
For the Price : 640, sl is around 550, once it moves to 750, my sl would be 650 and I would exit my most (80%) at 820 and leave the rest for growth.