WOWSER,,,
They appear to show lighting time issues..... Leaf curl and single leaf sets at this age.....
Light stress is my take on it.
Be sure they are getting 18+ hrs of light. Be sure that light is intense enough.
At this point, I would be far, far more concerned to get them on track and stable before much else BUT, I might be inclined to top at the same height as the tallest end of the tallest branch.
I would also up pot that to a 1 gallon with fresh soil and light feeding, very light unless the plant says to give more.