First, I'm surprised your custom emblem cannot be applied to your warriors shield. Anyhow, in matchmaking every emblem must be enlarged, its current visibility is tiny/microscopic (Is the point to get players to squint?) . To finish off, I expect more emblem customization on release. Add more layers and/or symbols.
I agree, it is odd that you have to make an emblem, that fits into a shield, and you pick the shield design, but it doesn't ever go on the shield. I think when the emblem is on the clothing, it shouldn't be consigned to having the shield design on it too. Just the emblem, and colours you chose -- no shield border.