I do not think that you will be penalized for any grammatical errors or poor writing ability of your band director. They are not deciding whether to admit your band director to their university.
With a 3.57 unweighted GPA, I would not bother applying to Princeton, nor to UT Austin as an out of state student. Georgia Tech would be a very high reach with this GPA. I would not call UIUC a “toss up”.