Update - 30 October 2019
Initial 90 point gapup was unexpected. I had a straddle of 11800 which did not came in loss. Still around 11820, I sensed that market will bounce and will stay around 11850 for one or two days so I closed straddle at profit and created a butterfly. Did +3 X 11800 CE, -6 X 11850 CE, +3 X 11900 CE. It had a max loss of 8 if market breaks out and max profit of 40 points if market stays at this point.
I rolled up Bank Nifty from 29300/29000 put spread to 29500/29200 put spread.
I rolled up my 11700 put to 11750 put. I sold some 11950 calls which I covered at profit.
Bank Nifty was not moving up with momentum as Nifty so I sold 30500 calls to hedge put spread.
This is my final position:
Here is the trade sheet: