In my opinion plannnig for Universal is nothing like planning for Disney. At Disney your every minute needs to be mapped out. At Universal it is much more flexible especially if you have Express passes. When we went in during Spring break I used the 2 day 2 park plan but it was only a loose plan that I referenced to make sure I hadn’t missed something. Use your 3rd day to visit your favorites or anything you missed.
The shows are not really scheduled a long time in advance. As it gets closer TP anticipates show times but you need to check back very close to your travel dates.
We are going again over Thanksgiving. My Disney days are planned. My Universal days are loosely planned as a reference. Mind you we will not ride RRRC or probably Hulk. It is nic you actually get to relax a little and just enjoy the experience.