Keep in mind that you have a max of 16 sectors for the ticket and a max of 6 sectors in North America.
Surface sectors count, also connecting flights use two (or more) sectors.
You could buy a separate side trip from one of your stops in the US to have more flights. You don't need to make your US stops in any logical order, but only one transcon flight is allowed and i believe you need to end in Hawaii and then continue from there.