Limit to Wall Shift-ability?

[QBUILDERZ]

I am currently making a wall hanging that requires a seamless transition between floors. All of the other stuff (mesh, textures, shadows, etc.) is out of the way, but I can NOT, for the life of me, figure out how to remove the stupid limit on how far up my object can move.

Even with move objects on and the ALT key held, it doesn't work. Any answers or even ideas are really appreciated. I made the mesh in TSRw, but I can use S3pe if I need to switch over :)

[Inge Jones]

I think it may be related to the bounding box. Any original mesh appears to be limited by how much it could shift without any part of it going through the floor or ceiling. Any mesh created from this original mesh appears to have the same limit - so if you reduce the size of it, it still stops at the point the original mesh would have been stopped. This would seem to indicate that the bounding box size also needs tweaking. I can't remember where those figures are - could they be in the ftpt?