Hi,
Giving fertilizer /"N"/Azote to the tree will help her branch and grow or grow and thus branch.
At some point they branch were they want, when they want. Just make them grow and let them decide where it will happen . Then trim and shape, if the result is not completely as expected .
I have my "longue d'aout" ... I could burn her ... But after 5 years, she seems to want to grow at a better rate. That lady is 4 feet/1,20meter of height with no root shoot at all ... She drives me crazy ...
But die-back, stinging bugs and rodents may be helping her being that stubborn.
She made 8 figs last year... So ok, let her be . I'm just fertilizing her crazy and watering every week a watering can or two .
"Longue d'aout" is described as a strain that does not send root-shoots ... I do agree with that statement .