More info here
Setup the truespace grid to match the unreal editor appearance set for grid spacing of 16.
The ASE exporter for truespace converts 1 truespace meter to 10 unreal units. So 1.6 meters becomes 16 in unreal.; The default truespace is set for a tile count of 40 with a zoom of 40 which gives each square a size of 1. The result is a grid size 80x80 or 800x800 unreal units. The goal is to get a grid 1024x1024 unreal units with grid lines spaced by 16.
grid count = 1024/16 = 64
tile count = grid count/2 = 32
zoom = tile count * 1.6 = 51.2
This process needs to be done for each 3D viewport.
Finally, set grid snapping to 1.6 and the grid will line up with the snapping coordinates.
Collada export is 1 truespace unit = 1 unreal unit so scaling up inside unrealed may likely be needed.
Unreal import ignores collada scale so use the freeze transform script before exporting.