Dynamic Material Instance in substance unreal plugin 4.27 clamped at 256 texture resolution

Hi,

I've been trying to set up dynamic material instances following this documentation  Blueprint: Dynamic Material Instance. Unfortunately I think the documentation is outdated and no longer works as it references nodes in step 11 & 12 that are no longer in the plugin since the refactor. I found this thread stating the new workflow for setting this up which I got working, however, even though the textures are set to 1024 in the material instance at runtime the textures generated & used are generated at 256x256. What is the fix for this? I've attached an image of my blueprint set up. Any help is greatly appreciated!