Great to hear it's better with PUA 2021 core! I've made it throw it instantly at button press (shoulder button on CD32 pad) instead of waiting the last frame of animation (for best possible responsiveness: gameplay first).
You'll thank me after you try a version that throws the knife only at the last frame, believe me, it gets in the way! :D I might do only one frame, though, that would work too. Thanks for playing!