Your routine looks picture perfect, I really wouldn't be changing anything there. I think we often underestimate the effect changes have on our babies (some temperaments more so than others, too) - his entire world has shifted. I take it that the NW's have coincided exactly with you going back to work?
When DS was struggling with DH not home, DH did the bath, etc. everything in the BT routine except the BT feed. I think you could help LO by having lots of snuggle time with him when you get home - hop in the bath with him, cuddle with him and chat while he's having his BT bottle, etc. You will also need to be upfront about leaving him in the morning and tell him when you'll be back (not a time, but an activity, like "I'll be back just after you have your dinner and we'll have a bath"). Your DH can then distract him with something to help him cope with you leaving.
Your DH can maybe start doing some special things, like taking him to a park to explore, or swimming or something as a special daddy-baby thing to give him a bit more confidence. There's nothing like seeing LO learning and enjoying life to give you confidence
You could pop a shirt of yours that you've slept in for a few days in his cot with him (or sleep with his sheets) so his cot smells of you - that may help, but keep it safe... you know his capabilities better than I do.
You may be doing all this already, but keep it consistent and he'll settle into the new way of life soon.
