You might wanna try getting some Schultz Rooting and Hormone Powder and mix a dime sized hefty chunk into the next 3 or 4 waterings.

Those roots aren't spreading and thriving for some reason. This will help them get going.

Your taller one is now pleading and begging for light on those new secondaires. They look promising but...will need some real light.

Looking good....let em grow some more