Campaign balance

Hello guys, I have a concern regarding campaign balance. I have played 4 campaigns (2 core 2 hoth), thats a total of 48+ games, I have played half of those games as the empire and half as the rebels. I've recorded all results with an app, and the numbers says that the empire wins 2 of 3 games. Its kind of frustrating, we LOVE the games but it feels really unbalanced. We are a group of experienced boardgame players and we feel like we dont make rules mistakes. has anyone had similar experiences with the campaign?