Hey Willow, sounds like how Natty used to be as well. In the first couple of weeks though, she used to sleep for longer periods in the day, then would be awake for a couple of hours in the night, just as you said your DS did... every night! She wasn't unhappy, but was just wide awake, usually with the hiccups Fortunately that stage passed pretty quickly, and then the daytime catnapping began. Sometimes she'd sleep for 2 hours, sometimes 20 minutes. I used to get so frustrated because once she went to sleep (which would often take a while) I'd never know how long she'd be down for. And its not like I had something to do, I just wanted to know.
At any rate, it sounds to me like you are doing everything the sleep schools would recommend at this point - putting him down drowsy but awake, settling in the cot etc etc. You sound to me like you have everything under control (as much as you possibly can!). But, if you feel you need the reassurance and extra support, then go for it. I know it isn't for everybody, but I have found the Tressillian helpline a brilliant resource. I've rung them twice (I wish I had've used them earlier on!) and they have been very supportive and respectful of my feelings.
All the best, and I'm so glad he's having a nice long sleep this morning! Make sure you have yourself a lovely cuppa (in lieu of a nap)