So a couple things, I was never charged any kind of deposit until about 5 days before my trip. It was my first time staying at the Dolphin and I wasn't as familiar with their booking system. I got in the habit of just constantly checking my date range and the second it went down, I'd grab it. (I needed to drop a night on the reservation once and called them directly, when she went to make the change the price per night jumped up $400 per night and she wasn't able to switch it back, twas a headache, luckily I had screenshots of my rates and a manager was able to override it). Because of that, I was always nervous that if I went and tried to modify, I'd inevitably do something to screw it up and lose my original rate. Sometimes it was only one room that was a lower rate and it would bump back up once I grabbed it. We went with another family and they weren't able to get it as cheap as we did.
I'm sure it isn't realistic for the average person to do it this way and I probably have way too much time on my hands, but it worked out for us and our wallets!