I’ll have to say again what I just said in a much longer reply which somehow disappeared into cyberspace.
Keeping it short because I am slightly aggrevated about it.
It sounds like you need to lose the all-in-one controller (regardless of whether is has no soundcard – VCI-100 or does – S2).
You clearly love your mixer too much. Toss the VCI, buy two midi-enabled DJM like mediaplayers (either full-size like the DJM-900 or something of the smaller variation).
It will be a setup like that with which many generations of DJ grew up. Left player, mixer in the middle, right player. The only difference is having two usb cables running from your media players to your PC to control the decks in your DJ software.
By the sound of it you don’t seem to miss the FX in your software as you prefer the ones in the 909.
Setup is straightforward (actually easier than your current setup with your external sound card) and pretty fool-proof.
Added bonus: stick some CDs in a wallet or case and you have backup in case something happens to software/laptop.
Greetinx.