The weather patterns have been very unstable in the NYC area over the last few months. Very cold one week then warm the next. Most of fig the trees in The Bronx, have been seriously damaged, if not killed back to the roots. Trees will shed what they cannot support, and, for whatever reasons. Newly planted trees are no exception, and breba especially, can abort.
Pinching question: After 6-8 leaves have grown on the stem in question, locate the terminal bud, and pinch out this bud. Try not to damage the tender leaves near the terminal bud. That's it! You're done. If you want a branch to extend longer, for design reasons, or to fill in a bare area, don't pinch it. It's that simple. Pinching helps set and ripen a main-crop of figs sooner, and also controls growth. YOU decide how it's gonna be.
In a few seasons, and with a more mature root system, your new tree(s) will more than likely, settle down. Enjoy the growing experience. The main-crop figs are the prize.
Good luck and happy growing.
Frank