Thank you for the info and also tagging them in - I forgot to mention that I also have a cheap home depot (HDX brand) liquid water test kit as well - they've all been pretty similar even with the pool store. Unfortunately the MPS is only in test strip form, at least what i've seen after searching, at least i know it has gone down after an extended period of not adding and it went back up after adding NC shock, so maybe some validity to it.
I've read the dichlor post previously and am definitely considering following that regimen if I run into trouble with the N2.
Thank you very mu