I recently discovered (after someone named Moeblob whooped me 7 times straight) that trying to zone a better Nu player is foolish so I started to be aggressive and unpredictable. Act Parser to their opposite side whenever you can and approach from the air (make sure you can block on reaction) .You should also be able to recognize a sword whiff and punish it.
If you have a really bad time with it, why don't you try setting up a Nu training session with some of the Nu players on Dustloop? I assume some of them would be happy to help you.