Re: TV Out Config
The problem is that in case of twinview with a DFP and a TV, the TV becomes the primary screen. This means that you need to put the refresh rates of the TV in the monitor section and the ones for the DFP in the SecondMonitorVertRefresh/HorizSync options. You can also use the HorizSync/VertRefresh options instead to replace it all. For instance: Option "HorizSync" "DFP-0: x-y; TV: 30-50" and the same for VertRefresh.
The problem with this configuration is that the login screen will appear on the TV which you likely don't want. I would recommend to look into 'seperate' X screens using which it is possible to make the DFP the primary screen.