Audio setup help. How do you use yours?

Im not sure what i have done, but again playing around with stuff that works fine and now i've ruined it all.

MY SETUP:

LAPTOP: VIA USB --> KONTROL F1
VIA USB --> VCI400

Audio comes out the back of the vci400 via the phono outputs, using two phono to rca adapters, rca cables to amplifier.

Now i'm getting crazy latency issues. What settings should i have in traktor and should i be using asio4all or not?

Really confused so any help, even just telling me how you've set yours up would be hugely appreciated!