5/3/1 is all about the right assistance.. Make DL day a back day rather than a "DL day". if that makes sense. And compress squats and military presses and make that a shoulder day. Boom.
Bench day: Bench, DB Incline bench, Tricep work, machine flye
Squat Day: Squats, military press, DB front/side raise, face pull.
Deadlift Day: Deadlift,: DB Row, Pull-ups, Curls for the girls.
Did that put on lots of upper body mass.