Hey MM,
that's some great advice from Daas and Canuck. I would like to add that your pots with only four small holes, taking a week to dry out can start to be a problem. You could start to have mold, bugs, and root problems, if it was my pots I'd poke some more holes in the bottom. You want good drainage and air flow to your roots, for strong healthy plants you need to have strong healthy roots I would also increase your air flow with fans in your grow room and try to hit a 3 to 4 day dry out time between feeding/water.
good luck.