If the deadzone problem is rooted in the game engine's audio mixing, no virtual surround DSP is going to fix that. The sound driver won't receive any more sound from the game just because you ticked virtual surround on. About all I can suggest is to try out the usual Source engine DirectSound3D + ALchemy trick. That will inherently cause CS:GO to mix the audio differently.
5/24/14 at 5:30pm