You use the delts heavily when performing back movements as well. You can train chest and delts together, but break it away from the delts. Here is a better program:
Day 1 - OFF
Day 2 - Delts and Arms
Day 3 - OFF
Day 4 - Legs and Abs
Day 5 - OFF
Day 6 - Chest and Back
Day 7 - OFF
From the info you gave, I would also put legs and back as far away from each other as possible., Because of the chance you do SLDL and regular deadlifts for the 2 days.