As others have posted, I also suggest booking now. The points booking cost for the Swan, Feb into early March, is 16,000 points, instead of the usual 12,000 points per night. When I inquired about the increased cost, I was informed that these months were considered a "peak" period. This increased cost in both cash and points bookings has been the same for both 2017 and 2018, during those months. Though the points cost for the Dolphin in February is the standard 10,000 points, I'm not surprised that the cash cost is higher, than normal. So, again, I would suggest locking in a room, now, and keeping an eye on rates for a rate drop.I'm in the early stages of planning a trip in February.. I usually don't know this far in advance that I'm going, so I have more time to plan this time around. Since I usually book closer to my dates, the rates for the Dolphin are usually discounted by the time I book, but they still seem a little high for Feb. Should I book now to lock in my dates and try to re-book if the rates go down, or just wait and see if the rates go down before I book? I don't have plans to eat at any difficult to get ADRs, so I don't feel the need to start making them at 180 days.
Interestingly, enough, the Swan happens to have some lower cash rates in February, which you may want to look at. The Swan is rated slightly higher, than the Dolphin. Their two-bed rooms have queen beds, instead of double beds found at the Dolphin.