Alright I’m following, I think. Here’s what I did, if I’m wrong and you don’t feel like explaining further it’s all good. One of these other dudes will chime in I’m sure. Anyway.So say you're trading vol on XYZ with shares at 215 and you're bearish. You enter into a 180/190/200/210 put fly long from 2.2. You want to determine your static stress at neutrality. Static stress means current values save for price of the underlying. No change to vol or TTE (time to exp). No change in the smile. No accounting for vol-inverse to share/index price.
You are looking at a DN price of 195 (mid between inside strangle) which is your neutrality absent the price of the forward, but let's assume it's the front month that you're trading.
You stress (static) by pricing the 200/210/220/230 condor (neutral condor). The neutral condor is trading at 4.9. Therefore your gains to neutrality should be something approaching 2.7 points--static stress ignoring change to vol, decay, GBM, etc.
for sake of stress example;
Idea: sept djx put condor 15/30/40/55: 2.22 debit vol 33.78
stress: 40/55/65/80: 5 debit
stress is 2.78?