I went to a district seminar on the differences between qualifying for an IEP versus a 504 and how that fits with the state's RTI document. I will see if I can find the handouts. Not sure if I kept them.
My understand is that the state has rules that you must fall below a certain percentile (12th?) in reading achievement to qualify for a dyslexia related IEP. There is no such requirement for a 504. We were seeing a lot of the same reading glitches that you are. We used the discrepancy between DD's IQ and achievement scores to argue that her reading/writing ability was impaired by her dyslexia and dysgraphia. On my DD's IQ test everything was 97th to 99.9th percentile but her achievement tests in language arts were low average with some individual subtests below the 10th percentile. I think that DD's obvious dysgraphia may have made our case easier.
Can you find out who is your district's 504 compliance officer? It might be worth giving that person a call and explaining your circumstances and your school's reluctance to offer accommodations. I know that the compliance officer in our district encourages people to call when they are getting stone-walled by the school. She acknowledges that not everyone at the building-level understands their legal obligations.
