Did you add any additives to your water? What kind of salt did you use, and what's your salinity like? Your pH shouldn't be that high, 8.2 is about the highest I've seen recommended. Have you checked your test kit against a different one? Maybe you can get your LFS to test the water for you, and see what they think. I'm not sure how you can lower your pH other than to do a water change. If you have salt water made up for a water change, what is it's pH? Just trying to get a better handle on what's going on.