Multiply your options IV by square root of 52 for the Implied weekly volatility then divide by 2 to get the 1 Std Dev down move for the week.
That's an interesting trade that I might copycat. You have down trending volatility averages (not skew) and backwardization working for you. I can't say much about where ZS could go but you are short at a very steep part of the forward curve.
I will not lie to you XM, but I don't have a clue what you are talking about, although I would like to understand it and see why it is in synergy with my way of screening for viable options trades that might work out in your favor.
I look at charts and then look at prices!
Volatility is range, so when you see a WRB you can be assured the volatility is changing, which means the option prices are changing.
I was never any good at high level maths, but I would like to learn more about the way other option traders screen for possible viable trades, and more importantly, how they manage risk when the underlying moves against the trade.
My thoughts are that one requires a good piece of software that is easy to use and understand, for, what better to work out maths than the PC!
I think what matters most is where the price is going next, so, if you have a high probability method to determine where price might go, you indeed have an edge and thus have an easier life in monitoring and adjusting trades to limit losses.
BTW, the spread I am talking about traded at -18 in the past.
J_S