+2. That level of hopping is less than typically used in most APAs. For reference, I use 4-5 oz/5 gallons added in the whirlpool (post boil) for flavor and aroma, and also dry hop with 2.5-3 oz/5 gallons. It's on the hoppier end of APA but it's a ballpark reference. Also, agreed on reducing O2 contact. If you keg, purging kegs with CO2 before filling and also purging the headspace after closing the lid goes a long way to preserving hop aromas.