Converting Meshs to Terrains

I recently switched to Unity from another engine and would like to use my terrain from said engine, since it would take weeks to rebuild it. I exported the terrain files as objs, all 2,721 of the Terrain Tiles. Then using the Object2Terrain script attempted to convert one of them. I have run into a bit of an issue, the terrain generated is vertically stretched quite a bit. I know that it is due to the Terrain Height setting on the terrain, but I would like to have it set to the max world height, and since It will do this again, even if I could figure out the proper number to plug in, when I adjust the world height...

Any ideas?

If it matters, I am using the JavaScript version since the C# version crashes.