I would not use an ED unless the school were a clear favorite. The boost often is not as great as it looks because those students often have other strong hooks, athletic recruit and legacy/donor being the top 2. A good strategy for a kid with your kid’s stats is to apply REA to one of HYPS. The results will give you good intelligence on where your kid’s application stands. He should also apply EA/rolling to the publics he puts on his list. The goal is to secure at least 1 admit before Jan 1 so he can cut down on his RD apps.