in most of your pics teh soil looks so fuckign wet man. Chill out on that little bitch. Leave her alone. i never fuck with a plant at that stage....ever really. i soak the soil real nice when i put the seed in the cup, in 6 days i come back and i got a little plant. i water a tiny bit more (3 oz? in a 16 oz cup of soil?) and then in 6 more days it's a couple inches tall and it goes into a bigger container. You're thinking about this too much, and your fucking with it too much. It will grow pretty easy if you leave it be, thats why call it weed man, lol!
Good luck and be safe...