Those cards definitely work well together; I think RW Humans will probably be a thing. In this deck specifically, you might look at how much gas you've got and when you expect to run out. Chandra is insurance against late game, but I think that if this deck goes past T6 without winning on the board, then Chandra isn't going to pull you out of the hole.
It seems to me that you're expecting to
go for the throat on T4 after you've played Thalia and Hanweir on T2 and T3, so focusing on how you plan to spend your mana that turn is key.
Collective Effort and
Always Watching are the obvious plays, but that's 3 of your possibly 4 mana on T4. What are some good 1 CMC cards in standard that you could add to that turn to really maximise your efficiency?
Similarly, I think
Thraben Inspector is a really great card, but if you're spending T2 investigating, then you're not spending it getting another creature on the board.
Lastly, I worry about the colour weight. Almost all your 3-drops have 2 weight, which means that you're going to be able to play either a red one or a white one, but not both. You should probably decide which colour will be the primary one, and then just add 1-weight cards from the other colour as a complement. I vote red secondary so that you can have 1 CMC haste creatures to accompany those two white buffs on T4, but you could go white secondary and instead play more for control with burn and expect to be more midrange than straight aggro.