Mine is not so much a CC story, more of a general sleep story.
DS was also 8 months, never slept through, was waking 3-6 times per night, for 20min - 2 hrs at a time. We tried everything - I stopped BF so as not to give him the wrong sleep associations, had a sleep consultant, took him to a cranial osteopath. Nothing worked.
He refused to come into our bed.
When we tried to do cc, it was not possible because he would scream histerically when we left the room, and then even louder when we walked back in after 2 mins or whatever. Seeing one of us around really seemed to upset him a lot. So never really managed to do more than 5 mins of this.
One day we were in the park and he was screaming his head off because he wanted to be carried rather than sit in the buggy. I had a lot of stuff to carry so could not take him too, all I could do was let him scream and stop every few minutes and stroke him and tell him it was OK. It took about an hour to get home and he fell asleep in front of our door.
That night, he woke up for the 4th time at 2am and would not go back to sleep. I tried for 3 hours, he just screamed and screamed in my arms. Eventually I was so tired I thought I would die so just put him back in his cot and left him there. He was very tired too so he cried but in a whiney sort of way, on and off, for about 40mins. Then he fell asleep and slept until 9am - unheard of!
The next night I put him to bed and left him there. He screamed histerically for about 5 mins, then moaned for another 5 and then went to sleep. And slept all night. And that was that.
He became a decent sleeper from then on (except now that he is 2.10 we have a whole new set of sleep issues).
I don't know if this helps at all, I guess not but I think the moral of this story is that children are very very different. I did not sleep-train mine, I just followed his lead out of pure desperation ... and he sorted himself out eventually.