Do the tools you have show the entire hard disk in one screen I guess not. I mean you have to go through levels to see detials of usage of every folder and in the process you will lose the comparison to another folder or file.
This is where SequoiaView plays its part a small yet very effective tool.Which shows the entire drive in one view.View the map below.
By Viewing this map one can easily find the culprits in a drive. This even scans application data folder, system volume informtaion and local settings on there is no where the data can hide.
This tool can be downloaded at (453KB)