Using a Phoenix? They have just a bit more venting, so maybe unless seriously overpowered - use one lower sail. Instead of mid - use std. Or if everyone else is on full vents, use a mid. When I fly with my team of all Phoenixes, all is good, we all agree on a certain sail. But in my team with mixed quads, I usually try to stay a bit overpowered and use more brake in my setup.