PCSoftwarehulp what you are trying to do might be better accomplished in a bug report which gets the attention of developers. Forum posts don’t necessarily do that. Developers would be better able to help with this than users on forum. omv-bug-report.log should always be included with a bug report. More about that here.
I don’t have nvidia graphics. Last time I did XFdrake would create a xorg.conf file that among other things tells system to use nvida, or what ever specific driver name is (like nvidia-current, nvidia-304, ect) and it would automatically blacklist nouveau. If it isn’t doing both of those there is a bug which needs to be fixed. To do that someone with nvidia graphics needs to file a bug report including omv-bug-report.log. In other words XFdrake is supposed to completely configure graphics driver and install any needed packages or there is a bug. To be solved bugs need to be reported.