Hey there anon. Your ask is no bother, and I hope I can help. I will be honest, I am not very familiar with BPD and how it affects a person’s thinking. I can tell you though, that as someone with bi-polar, the way I can tell that my condition hasn’t effected my kintypes is when I still feel them when I’m not being effected or heavily effected by my condition. I HAVE had a few times when I’d been like, huh, is that a kintype. Nope. Just mania.
Likewise, i feel the solution to the question of kintypes versus fictionflickers is the same. Consistency. Something is a kintype if it doesn’t go away.