Is there a way to scale models to a size of let's say 1x1. X_SCALING apparently only scales from the original size, it seems?
Yes, it's from the original size.
You must scan all the vertices, take the highest value, and use it as the scaling value.
For example, your highest value (x, y, or z) is 250:
Your scaling value = 1/250 = 0.004
X_SCALING 0.004, 0.004, 0.004
Thx, great.
As long as you don't have tonnes of models, it's usually easier to load the models into your model editor and scale it there.