Modifying Duxa UI - Containers Issue

[Drakborn]

I'm going crazy trying to modify my bags so that they're horizontal. I've almost got them like I want except for the "padding" around the bag slots. In the following, the top and left side are padded correctly, the right and bottom side are too thick.

https://i.imgur.com/96050gD.png

The code for my EQUI_Containers.xml is here: https://pastebin.com/1nSmjnLw

I feel like the issue should be in <Screen item = "ContainerWindow">... I would expect this to be the issue:

<Size>
<CX>412</CX>
<CY>52</CY>
</Size>

I figured 40 width icons, times 10 bags, plus 12 total padding = 412, similar in the y direction.

Can anyone who actually knows what they're doing take a look? I'm just a monkey pressing buttons over here...