In my experience curling is a direct result of habitat. However it does seem like these are more glossy as my CKM was. My CKM was natural, and had a glassy/glossy/almost waxy appearance. I would attribute this to cold temps during lights out. If its not perking up towards the end of the daylight cycle, this MAY be incorrect. But its all trial and error. This is why some of the best growers only stick to a few strains, because they know it inside and out.