I think there may be some differences between WM (v.99) representation and TG. And that WM doesn’t export the height information in .TER files, and also that the values for height may differ to TG…
Try positioning your camera in TG roughtly in the same place as it is in WM. Then manually scale things.
Also, it may help if you do this in a different terrain, one with less confusion on it. Something that looks like a heavily terraced version of the terrain. Something that is simple to see in WM and try to match in TG.
The idea would be to output this simplified terrain in WM with the settings you have, and then input it in TG to adjust TG’s parameters and match the scales there…
V1.0 will have a better support for these settings, so this is just a workarround for v.99