Hi @SquaresJackal10,
In a Mixture design, it's very easy to limit the number of factors involved in the experiments: the repartition of points is influenced by the model you assume in the Model panel. Using the Custom design platform, if your assumed mixture model contains only effects up to 3rd order, you'll have only runs with up to 3 components in your Mixture design.
For the last factor ratio base 1 / base 2, I would recommend either to use a numeric continuous factor, or a discrete numeric factor if you want to test specific ratio.
See previous answer and solution from Optimizing a Mixture of maximum 3 Ingredients, with 5 ingredients to be Evaluated. for more information.
Hope this answer will help you,
Victor GUILLER
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)