in WED (to find and modify an overscaled model):
- search for your model into the left pane by name
- right click on it and select 'Go to object' (it's just to position the view)
- select on the left-bottom pane 'Position' tab; try to input manually scale factor into 'Scale' edit field
- in the 'Rotate' field you can type exact angle

also, you can setup moving/rotating snapping in the 'File/Preferences' menu.