I think the point is that downgrading your cios of 249 may work for this particular game, but there is no doubt that it will break the possibility for alot of other games that previously worked ok.
Whereas using the 224, would not have such an adverse effect on the overall playability.
Thus when other users use your advice, they will have issues with other games, and end up wondering why lol.
By installing more Cios, you increase your range of playability options. So it only makes sense to increase your opportunity.