First Grow of the Season - μSetup

I've being watering every 4 days. I dimmed the lights down to 75 W, upped the Nitrogen and bought a new PH meter because the old one was not working, that's why the deficiencies, I probably was watering with water at more than 7 PH. See you next week! Anyway, after the summer, I got a new bag of coco coir and pots (5L) to avoid overwatering and the return of fungus gnats. Same setup as always though, the μSetup (micro), the keyword: efficiency. The Tent is a Zelsius 40x40x120 cm, substrate is Wilma Cocolite, light is Mars Hydro TS1000 dimmed down and the nutes are Terra Aquatica TriPart. I'm probably going to have problems with watering, humidity and light penetration but still, I wanted to maximize the productivity, I always thought that growing on bigger tents was easier but too inefficient, I don't know, will I regret ditching the 3x3ft tent?