I love that you've done this! I know you mentioned that due to modding limitations, its the most that can be done at this time. I'm assuming that means the colors cant be more vibrant?
Viewing post in Foxhole: Better Container Colours comments
In a sense, yes, the colours can't be more vibrant as we cannot edit the containers' materials and can only adjust the material layers to make them a bit more distinct and vibrant.
Another mod makes it shinier and a tiny bit more distinct, though at the expense of appearance, IMO, so it comes down to preference.
If you want the container colours to be as distinct as possible at any cost, it is a solid option, but it also comes down to taste. You can find it here: https://droider890.itch.io/shinyshippables