I would throw the crystalian in the trash list, they're obnoxious because there's three of them ( in certain instances ) BUT, if you remove the gank, they're individually weak sauce with a very limited moveset, so either way, you can't really fix this, it's garbage all the way down.
Crucible Knight is top tier and its tells are very clear, what is your issue with it? It was one of the most enjoyable boss fights for me, along with the assassins.
Attacks all the time and has too much defense to trade hits and too much poise to stagger. It was a nightmare with a slow weapon. With parrying shield I had little damage, with dual greatswords I couldn't land a hit. Also, one of the bosses that had input reading (another issue I forgot to mention earlier). I had PTSD when I saw one approaching.
Crystalines, I don't know, I liked them the first time because after the initial despair (how I deal with with this?), the relief was memorable.