Taking a quick look at the e-book (for I am an ADD training e-book collector junkie):
"Moving Up Your Working Max
This is the most important part of this program. Your working max will be adjusted at the end of each wave depending on your performance during the Realization Phase. For every rep you perform over the standard (The standard is 10 in the 10ís Wave, 8 in the 8ís Wave, etc) you will move your working max up a set amount."
As I understand it, you would simply re-adjust your working max at the beginning of the next cycle, based on your previous reps.
So you establish a (90%) working max before the first cycle, and continue on a rolling basis from there throughout several cycles.
He doesn't really make this particularly clear in the book!