Oh S., S., S.!
I have a 20 month old who has had torticollis & plagiocephally since he was 4 months old. Since so many physical therapists recommend/refer to Dr. Wood, I would be surprised if Anders wasn't being treated by him. I asked Dr. Wood if he thought a chiropractor and/or massage therapist would help my son, Devin, at one point. Even though he believes that Devin's case was one of the worst cases he had dealt with in a long time (well that's what he told me), he has not seen it make a worthwhile difference in other patients and didn't think it would help our son. He did say we could try massage if we wanted, but didn't think it would make a difference worth the cost (it wasn't covered by our ins).
To deal with the ROM, I would increase the amount of PT you're doing at home. Between 9 and 12 months we did stretches up to 5 times/day. I suggest this because the PT only gets harder as he gets older - I'm sure you've experienced some of this already. The goal is to really, really try to get ROM by the time he's 12 months, and stretching that often did make a difference for us. As you already know, the stretching does help the ROM. I will warn you, however, your child will hate it. Ok, well, Devin hated it.
I've heard that the tilt corrects itself when the ROM is achieved. With Devin that appears to be the case. Other parents I've talked to did NOT lose the head tilt when full ROM was achieved, suspecting that it was "habit" to tilt.
Other parents have said the tilt can be cured by placing a piece of tape on his skin (the non-tort side) to help correct this. I know it sounds weird, but if I remember it correctly it helps. You first straighten the child's head manually, then place a piece of tape on his neck near the collar bone or behind the ear. Then everytime the child begins to tilt, the tape will become taunt and "remind" him to turn his head straight. The Yahoo! torticollis group has a bunch of posting about it, and you can go there to get specific directions if you are interested. Since Devin doesn't have a tilt I haven't tried it personally.
Good luck! Feel free to send me messages if you have questions, want to rant about dealing with torticollis, or just need to know that someone has been there!