first of all, train traps with back and delts
on back day make sure you do barbell rows and DEADLIFTS!.....along with your other back stuff
after your deadlifts( to end the back session) do heavy shrugs, 5 sets. first set of 8 reps to failure, second 10 to failure, third 12 to failure, forth and fifth 6-8 to failure.
When you are doing the shrugs, try to get your traps as high as you can, try to get them up by your ears!
after the back and shrugs, start your delts off with dumbell upright rows, and bring them up high, and lower them very slowly!
3 or 4 sets of 8-10 should do nicely.
then do your regular delt work.......hope you see results soon....i did when i did a very similar routine.