If you can read academic German well enough:

Die Entstehung der Mark Brandenburg, by Lutz Partenheimer.

Albrecht der Bär. Gründer der Mark Brandenburg und des Fürstentums Anhalt, by Lutz Partenheimer.

Die Mark Brandenburg: Band I (you may have to pay for the entire collection) by Johannes Schultze. Band. I and II deal with the foundation and development of Brandenburg until 1415, which already goes beyond your stated area of interest.

If you are looking for books in English then, unfortunately, you are out of luck. I have not been able to find a book on Brandenburg in this time period (and I assume you cannot find one either), most likely because the effort to publish a peer-reviewed academic book for English speakers on a relatively narrow and unknown area of history is usually not worth the effort, stress, and monetary investment. You will probably need to look for "survey" books (as in books about the wider region - the entire Holy Roman Empire, or a wider date - Brandenburg-Prussia from its foundation to 1815) but focus on the areas of those books that are relevant to you. This information will most likely not be extensively descriptive, unless it is also the author's (or an author's) passion.

Unfortunately, most of the focus in the English world has been on the rise and influence of the Hohenzollerns, which comes considerably after your period of interest.

Although, if you have access to databases, scholarly journals, or a university library, you may try searching in them to see if there are articles about your topic. It is far more likely that any academic information about Brandenburg before the Hohenzollerns can be found in those resources.

I hope this information helps.