5/3/1 Stalling

please dont say READ THE BOOK…i own it, ive read it cover to cover 6 times the question i ask is about stalling, i know there have been other posts on here as well but i still dont get it sadly… soo here is an example

lets say my 5/3/1 “max” is 160 on OHP but i stall out on tht and have to reset, here is where i get confused do i take the 90% of 160 which is 144 and use that as my new 5/3/1 “max” or do i use that as my one rep max and put tht there???