I've got a Diamond Stealth VRAM card, based on S3 911 chipset, and I'm looking for some software...

I've found Windows 3.1 drivers, but they aren't perfect - there's some font corruption in 640x480x32K mode, while other modes seem to work fine, perhaps some bug fixed in later drivers?
And I could use some utilities to set refresh rates, CGA/Hercules emulation, etc.

Any help?