I could pick out a few substitutions that I disagreed with (Borriello vs Siena), but he's brought on attackers in nearly all of the draws and they've not taken the chance to win the game. I don't think he can really rely on any of them at the moment, which is what he's got to work with. Matri's form has been sporadic, and the rest of our forwards haven't found their scoring boots. I'm sure we could all think of many wasted chances to win games off the top of our heads (Krasic vs Cagliari, for example).
It does seem like Conte wants to be able to use both the 4-3-3 and 3-5-2 effectively. I don't like the latter formation and hope he changes back, but I disagree that he uses it because he's okay with drawing games to remain unbeaten.
I think the problem is down to finishing good chances.