@ danw666
hello my friend, it doesn't matter where you grow, it matters in what condition your growing in, make sure the place is light tight, no light leaks when its dark period, check the humidity and the temperature, check the temperature ones the light is on for a few hours,
having a fan blowing is a must you always want ur baby's having oxygen, and helps with the temperature and stops mold growing on ur buds so more fans is better but bare in mind, if you have a fan blowing on ur plants make sure its not on high speed,
the other thing you need to think about is extracting air of your cupboard , and having fresh air pulled in.
is your 400w light going to be in a air cooled reflector? if not then see into it
i cant help you on feeding or watering, as your using auto pots but i will send you in the right direction, i seen one of my buddies making a thread on his auto pot grow let me find it and ill message you the link