Hi Michael,
Here is some feedback based on my experience.
It is well likely that SJP has higher standards than other nearby schools. I would take this argument to your advantage. At LAS we normalize the grades. Teachers should have a mean GPA per class of 2.5 within the range of 2.3 and 2.9. There are several reasons for that.
1. When two teachers teach the exact same classes (i.e. French 1 and 2), assuming the distribution of students is done randomly, they should, therefore, have approximately to same average class GPA. This is particularly useful for new teachers: it gives them guidelines in the grading level of the school. Furthermore it is only fair to the students.
2. Our academic standards have increased in the past 5 years but our average GPA remains more or less constant. Consequently, from an outside perspective we remain an academically strong and increasingly a stronger school. In addition, we are not falling into the trap of grade inflation, especially if our academic standards would remain the same.
3. From a college acceptance standpoint of view, it should not change much. The colleges will primarily look at SAT, AP or IB scores which are world-wide standards, thus independent from the academic level of schools. In fact, our college counselor would even argue that if they see high AP score with a good but not high GPA, college admissions people will say, "oh, this school has high academic standards: they do not give out good grades easily." This can only help the image of your school from the perspective of college admissions.
At LAS we use 5 grading scales (yes, it is complicated!): Letter grade (A to F), percentage grade, quality points (4 point scale), weighed points (it is uses the 4-point scale but it is weighed with the AP/IB classes; 4.0 = 4.5 on this scale), and IB scale (1 to 7, with 4 being the minimum passing grade). I would simply argue that students really need to perform at a high level to earn an A at SJP. No grade inflation at our school.
For more information on our academics you can download our Academic Course Guide: