I made some changes after my last update, I placed the tent in a different spot (which really shows in the temprature, as it has increased with around 3 degrees).
I also found out that I had been watering my plants with water that had a Ph of 2.5 (!), I just got my Ph meter in the mail so that won't happen again...
Besides that, I changed the position of the lamp since it was apparantly too powerful to be close to the ladies. I did some research on the lamp I use, and it should be in the perfect spot right now (in the Light Compensation Point).