Running GMod with -dxlevel 80 causes all settings to go to default

I want to run the game in DirectX 8 but doing so causes it to default all the graphical settings so I have to go adjust them each time. Why does it do this and how can I stop it?

The command -dxlevel xx always resets the graphics settings. Run GMod once with -dxlevel 81, then remove it from the launch options and it should stick w/o it resetting the graphics settings.