My family is from Pohirtsi and Zadnistryany. I was told after posting this that these villages are not Boyko villages. But it does seem that Boykos had a big influence on Sambir Raion. The Sambir Raion flag and coat of arms even has Boyko symbolism from my understanding.
If you have any information on Pohirtsi or Zadnistryany, I would be grateful if you could share. I only know what I could find on Wikipedia.