Hi Mazgoth... one thing you need to stop doing is planning your watering on certain days and in certain amounts... you need to let your plant tell you when it needs watering and how much it needs. Overwatering is a state of being constantly wet and this will really ruin your grow if not kill it altogether... and underwatering can look the same as overwatering, too...
Your plant will tell you WHEN to water by being VERY lightweight... so every day, pick up your pot. Does it feel like it's almost lighter than air? If not, put it down and go on about your day. If it does, give it a drink. Water it enough so that water is coming out the bottom and collecting in a saucer underneath. Let that water in the saucer stay there for 15-20 minutes... the soil may drink it back up. If it DOES drink it back up, give it some more... keep giving it water until the soil no longer drinks up the runoff in the saucer and then empty the saucer and go about your day. Check the weight of your pot every day... as plants get into flower, they will need more and more ... but ALWAYS wait until your pot is lightweight before giving more to drink ... (all of this goes for nutes as well)...
Good luck!