We were in the double/triple extra range.
The only one we regretted tipping at all was the head server..who we only saw twice..once she introduced herself, asked who was celebrating what (we were a table of honeymooners/anniversary couples). She set up cake night for all of us, and we didnt see her again until the last night when tips were being handed out..and no one, not one couple at our table received a cake.
Not that we needed it, but, she was the one that made a big deal out of it the first night. We all regretted tipping her.