Everything so far sounds like it's going really well. The tightness of the incision is expected, I suppose. Mine felt tight, too, and my surgeon never said he had trouble closing it. Your precautions will get it to where you can stretch the skin and other tissues later, after enough healing to keep things closed.
It's great that your surgeon coordinates the after care. Most simply hand their patients off to PT, without overseeing the therapy at all. I'm so glad you are in the hands of this thoughtful surgeon and team!