I run two very similar decks, both regularly beat more high powered decks.
Collected Company is a staple in one of the decks. Also, consider taking a look at the following creatures;
Ondu Cleric (not a human, but an Ally who'll boost you life total like crazy),
Champion of the Parish (not an Ally, but it's a 1 drop that powers up and works well with all the Humans you have), a combo of
Makindi Patrol and
Hero of Goma Fada (give your Allies
vigilance and indestructible), and think about putting a
Gideon, Ally of Zendikar in there too. Overall, love your deck, looking to put some
Hardened Scales and Harabaz Druids in mine as well.