TTP

Well when people like dieting down it is best to stick with the same reps and sets to make sure there strength stay the same.. Now you mentioned you want to maintain your upper body mass and lose the extra fat.. That is possible..

Here is a split that I like:

Monday- Chest Tricep Abs
Tuesday- Quads Hams
Wednesday- Off
Thursday- Shoulders Traps
Friday- Calves Abs Forearms

All reps I write down must be done to failure ..

CHEST-
Bench Press- 1x12 1x8 1x5-6... This means increase the weight on every set. This is known as pyramiding works great on chest...

Incline dummbell press- 3x6-10 reps.. Grab a weight that you can do for a minimum of 6 reps and a maximum of 10 reps..

TRICEPS- Close Grip Bench press- 3x6-8reps..Grip the bench with a close grip about 5 inches apart..

Skull Crushers- 3*6-8 reps.. lie down with a barbell and hold it at your forehead. This movement is an extention.. Just extend it but make sure the barbell comes past the head to get a full strech..

Kickbacks- 6-10 reps..I'm sure you know what these are..

ABS- Crunches- 2*20 reps use weight for more resistance..
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HAMS/QUADS
Squat- Pyramid this also.. 1x12 1x8 1x5-6
Deadlift 3x6-8
Leg Extention 3x8-10
Hamstring curl 3x8-12
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SHOULDERS
Dumbbell Press pyramid.. 1x12 1x8 1x6-8
Laterall Raise 3x8-10
Rear delts raises- 2x12

TRAPS
Dumbell/Barbell (which ever can hold more weight) Shrugs.. 3x6-8
Upright rows 3x6-8

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CALVES
Try them on stairs with dumbells on shoulders
to controversial for the reps but try pyramiding them..
1x15 1x12 1x8-10 1x6-8

ABS
See above

FOREARMS
Wrist curl 3x12 (make sure you let the dumbbell roll to fingertips then curl it in
Wrist extention(opposite of the curl) 3*10

Try this routine out and see how it feels..