What assistance work scheme did you follow? I fully understand if you were doing the boring but big version with the 5x10 on main lift for the day. But there's lots of ways to get hypertrophy work in after the main lifts that shouldn't be too taxing.
Were you doing light leg extensions, leg curls, lateral raises, triceps extensions etc, or something more complicated?
My only point was, and in keeping with the spirit of 5/3/1 since there are no strict guidelines for assistance work, if you do the main lifts progression you will get stronger. Since that only amounts to 3 work sets each training day, there is some time to do hypertrophy work. Intensity and volume could be varied arbitrarily