No reason to really splitting leg training, I guess I thought the upper legs are a large group so if I'd dedicate a day to that, and then just do calves with shoulders it might help?
I see what your saying about Shoulders after chest and theres nothing stopping me switching the days around, maybe:
Chest - Triceps
Back - Biceps
Rest
Shoulders - Calves
Upper Legs
I have been doing dead lifts on Upper Legs day which seems to do the bottom of my back.
Here is roughly my routine:
