I would say that the 2 things I would want to see changed is to standardize the 2 "off" days as Sunday and Monday, company-wide. Since we definitely have to work Saturdays when working in the private center, there is no way around that - so they should allow all employees to have the same day off (Sun + Mon).
Another thing I think Maple Tree should do to set itself a part from the rest is to set the maximum teaching hours to 30-32 instead of 36. It can be quite hard to finish all of the required grading/marking/writing with the few hours that you get off during a week. Most centers are 36 hours teaching, and for Maple Tree to be better than the rest, it should lower the hours a bit, especially since Public Teachers teach about 24 hours a week maximum.