The PO4 readings look ok to me. I'm happy anywhere between 0.01 - 0.1 ppm, preferably around 0.06 ppm. Most tanks need to use a little bit of GFO or some other phosphate reducer. The NO3 is definitely low, but not undetectable. Set skimmer to dry skim so it doesn't pull so much out.
What's your fish list? Maybe you just need more fish poop. Also, that alkalinity line graph gives me heart palpitations...
