Mouillage Cove is much more protected. We were in there 6 weeks after Irma - we had it (and the entire USVI and BVI waters) all to ourselves and the balls were OK. Perhaps they have all since been replaced as they did at Christmas Cove. The day boats are mostly gone by 3 pm and you'll likely have the bay to yourself. Even in high season pre-Irma, I've always been able to find an empty ball midday.