Have you messed with your settings all I can really think of to solve it

PCSX2 unfortunately isn't a great emulator. Very few games on it run perfectly, and that game isn't one of them.

There isn’t another PS2 emulator that I know of (if there is, it’s probably even worse than PCSX2). Emulating the GC version with Dolphin might be a better option as Dolphin is a solid emulator.