Some good venus vibes being sent to your prospective lady's Sir! Yes-Sir-Officer-Sir !!!...
Here are the parents of your seed in Southern Lapland 1guy.
On this pic and due to low outdoor temperatures, no any plant has shown his gender yet, but they are about to.
They are growing here in the swamp with extreme high humidity levels under 22 hours of full sun all around them.
I show you this to make you aware of how important a higher relative humidity level can be at making a difference while they are still young.
It also explains why having them in little cups without a bottom is causing them some trouble.
Maybe you could still turn the male's cup around to see where the roots have been going ?
I expect his roots to have followed the sides of the little cup and make them go around in circles.
Roots should have the possibility to go side ways right away from the start and not become obstructed in their natural path.
Allowing them to go all the way unobstructedly will have them cover a 3D surface like they should.
Still it's not all bad. Your advantage is now that you will get smaller plants, which is somewhat beneficial under led I suppose, and still have opportunity to make a decent amount of bud.
As a matter of fact I am a big fan of your system using regular photo period responding plants that would otherwise get too big when growing them on 12/12 from seed on huge amounts of soil.
With auto's under HPS however I would not prefere it, because LST or bending would easely take care of that.
Auto's under led ? hmm, Let's see what happens... I ain't got the experience myself as of yet, so you'll rather be our guinea pig 1 guy