Hax is an awful KO card. The best two hit deck is one that can mix up lots of combos. Try something like:
That gives you even hands and should have a two hit or two hit + fury in nearly every hand. Denise and Tanner aren't the best cards Rescue has to offer, but Denise can KO with Alec, whereas Steve cannot. Tanner works well with the low power/high damage cards that you frequently see in Type I, who he can feed off of for KO opportunities.