I've been doing shoulders day then arms day for months and it has been working well. I know the "if it ain't broke" opinion is a popular one and that's what I have been living by. However, I moved up in weight on DB shoulder presses yesterday and pushed a personal best and I could feel the pump in my tris for the remainder of the day. Today I dropped in weight on CGBP. I did manage 3 sets but with lighter weight and less reps.
My arms routine is as follows
CGBP 3 sets 6-8
Preacher Curls 3 sets 6-8
Skulls 3 sets 6-8
Hammer Curls 3 sets 10,8,6
Weighted Dips 3 sets to failure
Weighted chins 3 sets to failure
Opinions as to whether or not I am over training my arms? I have no problem with dropping some sets but I don't want to undertrain.