Have a look on the bottle of neutro+ and see what exactly ppm levels of nutritients that dose gives you.
For example the ones I use the recommended dose increases nitrates by just a couple of ppm. But in a planted tank with injected CO2+liquid carbon you'll need way more than that, like 10 times that dose to achieve at least 20ppm. Same goes for the rest of the ferts and since it's a complete fertilizer, you may need to increase it too.
Decreasing the lights is a good thing. 30W leds are way more powerful than conventional 30W light and you may have way too much, so you'd need to intoxicate the fish with CO2 to cope with the light demand.