If you like your Lat, smoke Nightcap. I've tried all the English-blend Dunhills, and found them all to be just milder versions of it.
I had this exact same thing happen with newminister english luxus, it was an ammonia like taste too, just really really disgusting. I don't know what happened but I added some moisture and let it sit and now it's awesome. Same pipe too. Just let it sit and it should transform, I also find a bit of age on mm965 bulk brings out some tangy in the Va's.The taste is too sharp, almost acrid, and the room note is sort of sour like ammonia.