My company used to follow the same policy till we lost an airplane. It seems if you let the nose wheel drop, you will get a high VGTD and if you hold if off for a sec / fly it down to the runway, the VGTD will be a low one. If you ask me, i'd tell those chaps to stuff it
PS: i think the code you were looking for is VGMX [max G] and VGMN [min G]
Cheers