i would be very careful with overfeeding to increase nitrates as you may find a new problem in dealing with high phosphates which will result in corals dying and algae issues.
also, when i test for trace elements i find it helpful to test often (a couple of times daily) to see what effect my husbandry changes are having. those tests can have some variation and you wouldn't want to needlessly push your tank into a bad place before realizing it.
You were right, now I just feed a little bit my fishes and did a phosphate / nitrate test, nitrates still ~0, phosphates skyrocketed to 0.35 :sad2: so I'll check phosphates at 5 PM when the lights turns off to see what's the amount of phosphates that my chaeto chamber was able to consume.