David, you should try to reduce the conductivity at least to half of this, doing it in several steps over three or four days. P. nagyi is not the most delicate of all licorice gouramies but we never encountered a habitat with water as hard as this.
Leave the female in if there is a good layer of leaves on the bottom and many other hiding places for the larvae (swimming plants, java moss etc.); if not you should take her out. If fed properly the females often don’t harm their offspring, but nevertheless some do actively. If you are lucky it’s more easy to let the young grow up in company with their parents: for instance, feed freshly hatched Artemia and both are satisfied. But if you are anxious, take her out. If you leave her in, you will soon see the next spawning, and so on. I should leave her, but look intensively how she behaves. If she is doing something what you dislike, you can take her out.
I yesterday phoned with friend Horst Linke. He will show us a professional video of a Parosphromenus-spawning at our first international meeting in Hamburg in September. Nice to see yours.