Hi all...
This might be a late answer but I discovered why some avatars hover above the ground even though EVERYTHINGS been detached. I'VE GOT THE ANSWER.
Go to Edit Appearance>Edit Shape>Body>Hover... And then adjust using the sliders. And then SAVE.(Rename....whatever)
The mouse Right click then Appearance>Hover Height, the sliders should be set to "0".
Hope this helps