Scaling collision for static mesh too sensitive

I often rework static meshes in houdini and then import back to UE4. Havent found a way to import collision from houdini made fbx so need to use static mesh editor to generate collision. Often scaling boxes, but especially for bigger objects the scale is very unaccurate to work with since sliding the scale is extreme sensitive. Is there some tricks to avoid that or is that limitation? Working with static mesh collisions feel extreme slow.