Hacking Usb loader gx: Full screen games and an hdtv

[metadeath]

I have a question, On all my games i have on my hdd they all play in almost a letter box format. what i mean by that is the game goes all the way to the left and to the right of the screen but does not fill the top and the bottom. How do i fix this? What setting am i missing? My wii system menu shows in full screen but all my games from my loader does not.