In this case, btw, I think you should probably go back to the microloading you were doing before since obviously the bigger jumps may be too much. Which kinda comes down to you doing the right thing in the first place before I said you were drawing out the backoff too long
It would make sense to forget entirely about the idea of this being a back-off and continue progression exactly as before except with proper form and depth
I would go ahead and repeat that weight and see if you get all the reps. But then most likely you'd need to microload to get all the reps the next time.