Athosanswered grow question 7 years ago It's too much; it looks like they are in a storm. It's supposed to be gentle and though it helps, it's not a must, I've never done it. What you have might give you wind burn; which is when the wind excess dehydrates the leaves and they start to curl.
Also, be careful with how often you feed, once every 7 to 10 days is enough and according to you, you are feeding every 4 days or so. Also, unless you are using light mix soil, you should not be feeding so soon, most complete / heavy / all mix should last you a 2 or 3 weeks into flowering if you are going to up pot to a 11 liter pot. A 500 cc pot lasts me the first 2 weeks and a 2 liter pot lasts me the 3d to 5th weeks of veg before needing to transplant again. I would wait at least 2 weeks before up potting, else the roots might not hold all the soil and you could shock the plant when transplanting it.
Don't rush to flip to 12/12, I would recommend 5 weeks of veg in order to get a nice canopy that will in turn give you lost of flower. Consider doing TOP or FIM a week before switching to keep the canopy even; I would do it in the 4th week and veg until the end of the 5th week, then switch.