Great to hear, might be good to water by feel of weight instead of days in a solo cup. I hear ya its hard to both not overwater and not underwater haha They look like they want to take off, maybe a double solo cup or wrap something around to keep the roots from being fried. I'm not 100% that there even is a big issue but ive seen that before on some of my own grows, im sure they will be all praying soon and have fast growth.
The more I look at your pics the more I think im being too picky lol they look great! But the front two look a little .. something probably go away but if it gets worse u can catch it early if its even anything.