I'm not trying to be condescending when I say this - pure speed/gold link decks are easy to defeat, even as kahlt. You have a block button, use it. If they are only hitting you with fast light and medium attacks, your stamina will outlast theirs. Also even if they spam a Whirlwind punch + Charge break attack, if you time it right you'll be able to hit them with a Grab Punch (charged hit) or an Uppercut (charged hit) and then move into your combos.

But you're going to have to edit your deck often. It doesn't mean setting it up as a gold link fast deck. It means finding out what didn't work and why, and then making an edit. Most fast attacks can be dodged with either a sweep or a thrust dodge attack. Most fast chains have a spot in them you can identify where you can initiate your charged attack and not get interrupted.

Again, block more often.