Hi Toom,
When you are exporting your FBX from 3ds are you setting the scale to centimeters?
Also, if you have a mesh you could upload or create a simple one with the issue that you could upload I’d love to look into this and see if this is a bug or what the issue really is.
If/When you upload the mesh, could you include an exact step by step reproduction of the steps you use to get the scaling collision issue in UE4?
I’m not sure if you mentioned above or not, but have you tried using custom collision set up within 3Ds and importing that with you model rather than using UE4’s auto-generated convex hulls?
There’s a tutorial from 3DMotive about Custom Collison that is really well done to help you out if you’re not familiar.
I look forward to hearing from you!
Thanks!