I need help getting my voodoo 5500 agp to work with ANY steam game using SFFT 1.5

Using amigamerlin, i can run Half-Life 2 Deathmatch, but cannot change any resolution without or setting without it crashing. (and the game runs horribly, averaging 4-5fps)

Using SFFT 1.5, I can start HL2DM, but it will crash to the desktop within seconds of being in the main menu.

If anyone has any ideas, I would greatly appreciate it.

PS, Quake 3 and RTCW run GREAT!