Hi,
Back to your top pic, the stems look to be the fast growing suckers of one year of age.
You would have been better with slow growing suckers of 2 years of age.
The problem is that the top has too many branches of "weak"/unhardened wood.
I'm a little late, But I would have left 1.5' (40cm) above dirt and 1' under (30cm) .
It is better if those are T-shaped ( under-dirt flat and above-dirt stem going up.
Whatever you did, now you should water the area every week, no more, no less. Water to cover a circle of dirt around the stems, and won't water directly at the base of the stem.
Water gently as in trying to keep the dirt in place.
I did root three like that 2 years ago, and I had 2 smaller ripe fruits on one the first year, and had more last year. I can see figlets on them for this season - although I lost some parts of the newer stems due to the winter and because the stems were in fast growth mode.
Mine seems to be a true BT but the taste of those fruits are a bit better than the ones on my first BT . So I'll be comparing them this year and eventually keep both, or just one of them (space problems ).
Burying directly in the dirt is the most effortless method (while still efficient ) of rooting . And it works well with figtrees.
Mine, the first year, were two months late at bud-break. Just, keep on watering them.
They need a sunny spot. I had one that made leaves and a small stem, shed the leaves after a while because it was shaded by her sisters , then snoozed , and woke up the next year and grew last year...