I'm sort of in the same boat, so I don't have any advice, just my experience. I started ECing my 8 month old and she surprised me by peeing on the potty if I if I offered when she had to go. But it was still winter and I couldn't fully observe her elimination patterns--at that point she was out of the sling and fully clothed. The effort of removing her pants and diaper every 20 minutes to offer the potty was too much for me, so I stopped.
Four months later, I tried again and let her roam naked at home. I put her in a cloth diaper with no cover when we're out. Now I have a much better sense of her patterns and signals. The problem is that when I offer the potty, she resists, even if she has to go. I don't mind the mess--I don't have carpet, and because I pay close attention in the hopes of "catching" something, I always see the mess as soon as it happens. In many ways, this still seems more sanitary than letting her sit in her own pee/poop. But at times all my EC efforts seem like a smokescreen for the fact that the house has become her toilet.
But I still think there's hope. For one, I think she's learned to save her poops for home, which means I rarely have to clean a poopy diaper (BIG plus!). Second, she's never peed on me, not even through a cloth diaper. So I think she's learning to control herself (assuming she forgot it in the first place). And, I have been able to catch the occasional poop on the potty; it seems she's too focused on the job of eliminating to resist. Finally, when we're running errands and she's in a diaper, I have about 60% success rate if I offer her a potty break. It seems she knows that this is her chance unless she wants to sit in it.
I guess my hope is that once the cold weather returns and I can't let her roam naked anymore, she'll have gotten so accustomed to not sitting in her own filth that she'll have the incentive (and now the language skills!) to let me know when she has to go.
