Yeah, pretty much. LIke I said, the percentages are rather low. I spent several hours trying to get 2 specific familiars I really wanted. I just couldnīt get them. And both times once I had given up on them the next time I encountered them in battle I managed to catch them. So I think the game actually enjoys torturing players. :)
Btw, I think there are merit rewards later on which can raise your chance of catching familiars but Iīm not a 100% sure.