Well there's 2 ways to alter the bump map, one is when you import you get an option to convert the bump, the default is something like -0.0008 or some such, so I up that by quite a lot depending on what I'm bringing in, [I could be wrong with how that bit works though] and the second way is inside the material editor inside Vue, there are options in there to alter the bump mapping, none of which affects the poser shader tree.
I'd be more specific but I'm at work now until 9 p.m. UK time so no access to my Vue [boohoo!!]

Injustice will be avenged.
Cofiwch Dryweryn.