You are correct you can not just raise everything.
Now you could raise the
point chart 300 days of the year as long as the lowering of the remaining days offsets that. That being said there has to be some reason behind the change that is to benefit balancing demand.
Example you can't lower Christmas day to 1 point and crank up other days because that makes no sense so even though its allowed it then is not allowed because it goes against their requirement to balance the demand with making changes.