Just an update:

I am still using Prime and Stability, but it looks like you can get false readings while using Prime and it can not really distinguish "bound" from free nitrites. With the combination of Prime and Stability my filter really should be able to eat it up.
I have also heard that during cycling nitrites are usually the most annoying to level out. As in, one moment they are way too high, then the next day they are pretty much gone.