Hi mate, looking at your lamp distance I think it isnt that. Shes looking great. Maybe a little to much N (very minor burnt tips) not serious at all.
The curling could possibly be wind? Do you have a fan blowing on those leaves? If you do just give it a little adjustment. I dont think its anything serious. Just keep an eye o it over the next few days.
Hope this helps and good luck with the rest of your grow 🙂
10cm seems close to me. If its LED that would be to close. If its a blue/red colour LED I think the recommended hight was more like 12 inch when flowering, might have been higher then that.