Hi
@Foxtrot! During the vegetative stage, you must increase your Relative Humidity to the max, 50% being a minimum. A 35% RH is fine for the late flowering stage, since you want to prevent bud-rot / mold, but for the moment what you need is to get an optimal VPD (Vapour Pressure Deficit). Check this out: http://www.just4growers.com/media/23631/vpd_2degree.gif - if you manage to stay into the green zone, your plants will be able to handle breathing & sweating perfectly, and you will see a vigorous growth. Hope this will help, keep us up-to-date and happy growing 👊