Seems I can't get the right watering schedule...

Hi @Gr33nFi3ld! Yes she seems under-watered, and the pot's weight is a good clue. AirPots do not retain water as much as geotextile containers do, that could be a good or bad thing depending on the grower's availability/skills, the environment stances and the strain. I personally found that AirPots are not the best for coco (the medium dries too quickly), but definitely useful with soil (it prevents overwatering). I've seen some veggie-growers using AirPots and digging the whole container into water for a minute, I think I will give it a try someday. Growing in soil I have a simple formula for adult plants, I usually water with 15-20% of the pot's volume, so 11L container gets ~1.5L. Never exceed more than 20-25% unless you want to flush. You'll be soon into the late flowering stage, so pay attention to your waterings, do not overwater or you might encounter bud-rot / root-rot, do not underwater or you will loose in weight. Tricky game huh 😎 Hope this will help, let me know in the comments section if you need any further information, and happy growing! 👊