You have lots of room on your HC. If you put in some 94 Premium or whatever you have available, it will lower NoX but it will raise HC.

Make sure your cooling system is doing its job ie running the lower side of normal not the higher side. NoX is caused by high combustion temps so everything you can do to control temp helps. That's why Premium fuel will reduce NoX because it burns slower/cooler. It will raise HC for the same reason.

I used to have a 3.0 V6 Spirit that failed the same way. Lots of room on HC but failed NoX similar to yours.

Went to town and filled it with premium and it passed NoX by about the same margin it failed by and BARELY passed HC.

Kevin