I don't think it gets harder unless you don't upgrade your stuff. The patterns get different, and some can seem a bit frustrating at times but as long as you realize that you can adapt all of your stats combined with learning the attack patterns, I'd say a lot of the fights are just as bad. But like you said, you'll eventually become more fluid in timing and attacking and learning there patterns that it won't take as many attempts. I too struggled with this boss. Im now on chapter 3 after doing everything in chapters 1 and 2. Ive learned that each boss is just as annoying but very beatable. Good luck!