Keeping the mast centered and not over rotated will be WEAKER not stronger!!!

with the mast in the over rotated position and the halyard pulley swings to the side of the mast all the driving forward force is going onto the weakest axis of the mast which is now supported by the tension on the mainsheet = backstay. any sideways force is now on the strongest axis (fore and aft) which will be more than strong enough to cope.