Answer was very very simple , Its not un-symmetric , Its perfectly symmetric
Look at Bollinger band values 493 , 508 , 524 - 15 points apart ,
visually it doesn't look symmetric because the middle band is at angle ,
we can't judge visually once the reference point becomes tilted.
I think this is resolved now , It was at back of my mind for so many days.
I will confirm abt this.
Bollinger upper band = mean + 2 * standard deviation
Bollinger lowerband = mean - 2 * standard deviation
So the distance from mean on lower side and upper side is always equal. so from the moving average line, the distance of upper and bollinger band must always be same. If this is true, then how bollinger expansion take and contraction takes place ? I am searching for the answer and high huge set of questions like this. But everyone wants money to clarify my doubts.
Do post your other questions , I won't charge for answers .lol