It seems like you have cotton mouth which is also called saddle back. What is the brand of treatment you are using and what are the active ingredients?
Any scientific papers I have seen express the results in mg/l nitrate (mav 50 mg/l) or mg/l nitrate nitrogen (mav 11.3mg/l). MAV stands for maximum allowable value. ppm is not correct as it is referring to both weight and volume as the same units.
That exceeds the NZ Drinking water standard for nitrate and you should talk to your drinking water supplier and see what they are going to do about it.
The prime will convert the ammonia released from the treatment of the chloramines to ammonium but I understand that the test kits read for ammonium and ammonia. If that is the case then the ammonium will be safe at that pH.