New Physics by latest Statistic LIGO/VIRGO: Equal Mass Black Holes Repel Each Other, (with mass ration <15%.)
EQUAL SIZED/mass BLACK HOLES DO NOT MERGE, BUT FORM HERBIG HARO SYSTEMS.
Equal sized black holes with <15% ratio differences do not merge (see LIGO)
https://www.ligo.org/science/Publication-O3aCatalog/
As example: all dual Herbig Haro hotspots (bowshocks)