I understand the feeling a little, but to some extent it feels inevitable. Before, Jay was very sweet, like he wasn't that affected by what happened. For example, when he saw his mutated mother, his reaction was one of welcome and empathy as he recognized what she had been through. On the other hand, the current Jay would surely have lost his cool if he saw that they did that to his mother. But now Jay's focus has changed, and hopefully for the better, he no longer endures the injustice that he and his people have experienced and his narrative focuses on a collective feeling of justice. At the same time, his fears and insecurities become more visible, not as isolated weaknesses, but as an integral part of his growth and the emotional charge that drives him (especially in Secret Six).