I recently replaced my aging but well dialled in FLSun Q5 with an Elegoo CC2.
I am very pleased at being able to print much larger things, but I get this effect at height. This is an egregious example but even cleaner prints still have obvious layer shifts.
By no means an expert or super experienced with 3d Printing, but with the few taller prints I have done myself I've noticed print speed plays a big factor. At the higher speeds, the whole structure jiggles a bit, especially with limited supports.
Maybe someone with more experience will confirm or correct me, but slowing the print down would be my first instinct to prevent it.