Hmm, forgot about the shortcut then and just surf to the directory via command prompt and then execute "DOSDRV" and type go into setup.exe to setup your sound card, then execute doom.
(just running DOSDRV you don't have to worry about any settings made by the .vlp shortcut that might interfer). For instance, all VESA support does is enable the prompt full-screen by default....which the command prompt will do any way if it detects a graphics mode that is anything other than text mode.
Sounds like you need to play around with the idle sensitivty option in either the VDMSound .vlp shortcut (if you don't want to run DOSDRV manually) or in the command prompt if you wish to use DosDRV.
The above steps are why we like to use ports. 😉 I played Wolf3d and Doom when they first came out and remember being amazed by the graphics quality and interactivity. As far as I'm concerned anything that improves on that is a plus.