If he is laughing, then I wouldn't go to him. It's when he cries that you need to help him, and I think that you should do walk in walk out then.
He is probably still a bit unsettled about the house move. How long as he been in a bed? Is his bedroom verry different from his old one, I mean the decor?
TBH I have never had much luck with pd, it upsets Alex, but I have had success with walk in walk out. Firstly though I think that you should ensure that he is comfortable in his room.
Play in there in the daytime and perhaps have your stories and quiet time there. Does he still take a nap, and does he take it in his room?
Sorry to have so many questions but I am trying to work out what and when certain changes were made.