I just booked the april 8th sailing on the magic and this was my expierence with pricing changing from day to day.
HTH
We were going to be in WDW over our Easter break for 10 days and I had considered just taking a cheap 3 day cruise at the end of our vacation on either
RCCL or CCL. So I thought I would just check
DCL to see what there prices were and they were twice as much as RCCL/CCL were for a 2 adults and 2 kids so I was a little disappointed that night. The next day we had an Ice storm and our power was off almost the entire day and the kids were home from school. So I couldn't book the RCCL/CCL that day. Later in the day our power came back on and I decided that I would just check DCL website before I booked RCCL. and low and behold a cat 12 was listed and it was 1k cheaper than the night before

So I booked it as fast as I could. Well not even an hour after I booked it our power went out again for almost 24 hrs by the time I went to look back at DCL website the price had gone back up the 1k that it dropped.
So within 24 hrs the price changed by 1000$ So i would just keep checking on a daily bases maybe even a few times a day if you can you never know what your going to get

BTW- the cruise that your looking at is sailing over Easter weekend so the price may not drop since it is a holiday. I'll keep my fingers crossed for you