It is not clear why do you want to buy sept option and sell oct. option.I think you have already checked the strategy graph . As per my view if nifty at sept expiry goes below 5730, then you will get profit but if you sell sept 5100 put and 5900 call and buy oct 5000 put / 6000 call you will get a wide range 4920-6080 and probability of profit is much higher ,I am be wrong but interested to know any specific reason for your strategy
I do the maths instead.