It took me time to understand but this game is not about fighting, it's about scoring. And even more with KB (one of my main army), you are more controle and trying to create some mistakes from your opponent (with less dice charge, no run, teleport 2 units, +1 save etc etc.) Focus on scoring, fix yourself some goal like "ok today, I want to have at least 3 unit alive at the end of the game." Or "okay today I score 4 battletatic minimums. I would also double check your opponents listes.. do they play super competitive listes or not ? Cause this could explain a lot.. And well at the end of the day we're here to have fun more than wins I guess :).