It's 11 unique powers per day per level. On top of that, it says that you choose them when you manifest them.
So it's 11 1st ,2nd, 3rd, 4th, 5th, 6th, 7th, 8th, and 9th powers per day. Once you manifest 11 different powers of a particular level, then you can't manifest any more until the next day.
While what you suggest would be more balanced, that is not what is written.
EDIT: The Eurudite never actually says when the unique powers are chosen. Still, with 99 different powers available each day, I hardly think this means much.