Just got back myself. Scubatyme is a good boat and they do have afternoon trips. Morning is better/calmer. I had a shorty and was very comfortable, then again, I'm from Minnesota. Most people had a full 2-3mm wetsuit. It's a bit cooler below the thermocline at about 85 ft.
Not always true, there are no hard, fast rules as to what time of day is "better or calmer". There is also not always a thermocline below 85'.