I'll be blunt...not sure why you are in denial about your water parameters.The parameters are fine. It is something else. My ammonia is just barely above zero and that was tested shortly after dumping in a few dozen crawlers
Almost everything I have seen/read suggests Nitrate levels of 40 to 50PPM as the maximum. That's the upper limit; you should be aiming for lower. Your levels are about twice as high.
Why do you feel 80PPM and Ammonia readings of anything other than 0 are fine? Your fish are definitely showing signs of illness and your water parameters are far from ideal.
Have you considered adding Pothos to your sump to help lower those NO3 levels?