Once you reach Rank 44, (Which is the "Better Than Papa!" rank) there will be no more ranks even if you pass the number of points to go to the next rank.
To gain a 100% Topping Score, make sure all desired Toppings shown on an Order Ticket are correct and applied evenly. There are four (4) types of Toppings: Whipped Cream, Sauce, Shaker Toppings, and Placeable Toppings.