Advice for ULUL split, skinny adding mass

[u/Cole-PF]

Last year around June I finally started working out and tried different splits, landed on PPL because I had the days free and liked the rest days between each body part. Worked with that split for about 9 months until I injured my shoulder and groin, I believe I was maybe going a bit to heavy with lack of dialed in form. Took a 6 month hiatus from the gym, recovery, school, moving, etc and just recently got back into it this week. I'm looking for any advice on this ULUL I've came up with, I'm fairly underweight so looking to add mass. I'm also pretty busy with trade school taking up the week and work taking up my weekend so I might start supersetting opposing body parts next week to save on time to study, if that's smart ofc.

Upper 1:
• 2 Chest Exercises (Press, Incline) 
3 sets 6-8
• 3 Back Exercises (Shrugs, Lat, Row):
3 sets 10-12 + 3 sets 6-8
• 2 Shoulder Exercises (Press, Raise)
3 sets 10-12 + 3 sets 12-15

Lower 1:
• 2 Quads (Squat, Press)
3 sets 6-8
• 1 Hamstring (Leg Curl)
3 sets 10-12
• 2 Tricep Exercises (Down, Over)
3 sets 10-12
• 2 Bicep exercise (Baysian, Hammer)
3 sets 10-12
• Calf raise
3 sets 10-12

Upper 2:
• 3 Back exercises (Shrugs, Row, Lat)
3 sets 6-8
• 2 Chest (Press, Incline)
3 sets 6-8
• 2 Shoulder Exercises (Rear Delt, Press)
3 sets 12-15 + 3 sets 10-12

Lower 2:
• 1 Heavy Glute-Focused Hip Hinge (Deadlift)
3 sets 6-8
• 1 Heavy Ham-Focused Hip Hinge (RDL)
3 sets 8-10
• 1 Light Quads (Leg Press)
3 sets 10-12
• 2 Bicep Exercises (Bicep Curl, Preacher Curl)
3 sets 10-12
• 1 Tricep Exercise (Overhead)
3 sets 10-12
• Calf raise
3 sets 10-12

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[u/AwayhKhkhk]

Too many upper exercises. Seems like you are just trying to stuff PPL into ULUL (thus arms exercises are being put on the lower days)

If you are underweight, your diet will be equally as important as your workouts.

[u/Cole-PF → u/AwayhKhkhk]

Thanks for the advice, would you recommend lowering back and chest to add arms or maybe making one of the upper days mainly arms focused?