I'm not sure your starting value, but as with all the other dosing options be careful that you don't want params swinging. Bouncing nitrates from 0 to 3, and then bouncing phosphates also count as param swings. As is the bounce when you subsequently get an algae spike which then bottoms them out again.
The benefit to feeding is it'll decompose slower, so bounce slower, and the obvious one that it feeds your fish. Also little bitty pieces the corals, and copepods, and amphipods will eat.
I also have been testing dosing nitrates/phosphates in addition to feeding more. I couldn't get my phosphates to drop, despite controlled feeds, wet skimming, and a fuge. So I started dosing nitrates by putting some in my ATO water. I wasn't measuring, just adding a bit to see if I could get it detectable. I never did, and had the stuff for a phosphate reactor, so I just went that way.