I guess only you could tell if it is too much, I know some would say it isnt but then some would say dont go overboard. You could probably drop the arm work if you think it isnt working, which seems to be the case. Maybe try close grip chins?
If you wanted to lower your volume a touch but increase intensity/effort you could do something like what I do
A: squat, bench press, bent row, dips
B: squat, military press, deadlifts, chins
I havent done curls since I started my journal and have still noticed gains in the size of my arms.