AH-1W helicopter has serious maneuverability issues

AH-1W has serious yaw issues, which seriously affect normal flight. In addition, incorrect data was filled in for the maneuverability of AH-1W. As a twin engine helicopter, the performance of AH1W is even worse than AH1F, lower than MI8 helicopter
According to the publicly available information I have found, the AH-1W is one ton lighter than the AH-1Z, and the difference in engine output is very small. Why is the maneuverability performance of these two helicopters significantly different in the game?

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