So glad to hear you've got everything you wanted!
Not sure the reason, but here's my experience.
We have a one-day in WDW (MK) planned on 12/24 as we pass through town going to visit family. I booked at 60 days out and got everything I wanted at MK at the exact times I was hoping including Splash and 7DMT. I never dreamed that would happen for such a busy week! So excited since we've never been in the parks Christmas week or experienced the parade or fireworks.
As a comparison, we have a 4-day trip in January where I booked FP this morning, it was a lot easier for 12/24 than it was for 1/25 at MK. Was aiming for an afternoon 7DMT figuring no problem, but all that was available was close to 7 pm, an hour later I was able to snag a 5:10. For FOP at 60+2, 60+3 (I didn't check for 60+4 since it's our last day and we have other plans), all I saw were evenings and they went quick. I went back to try to mod my 6:50 time (60+2) and no dice for any availability.
All in all, very pleased, but surprised December 24 was easier.