Double check in nHancer than you have Rubini's SH4 settings selected. Right-click the nHancer icon in your tray, choose activate profile, and select Rubini's SH4 settings. If they're not there you'll have to go back to the
nVidia Tweaks thread and reenter them. This time make sure you name them with a unique name so they can be reloaded manually (check the box for manual selection).
You'll have to excuse me, I'm still looking for the head (kopf) on this blasted U-Boat.