A little bit of a mixed question, since focusing on any plan will help increase your FTP. However seems like the question is really “how do i go further, faster without fatiguing”.
Sounds exactly like my previous training. For a century and endurance ride, I’d suggest the sustained power to hold power for extended period of times. Will prepare you very well for that since it’s a stead state effort and heavily focused on muscular endurance - can speak from experience with this one.
The short power plan definitely has its fair share of focus on long intervals (ie baird peak), but bakes in more shorter, 2-3 min 120% FTP intervals. I recently switched over to this to keep up with my buddies in our weekday world championships, which is a punchier/aggressive style ride.
I’d suspect if you haven’t done a century yet or completed a full TR plan focused on that, I’d start with the Sustained power and see where that goes. It’ll certainly boost your FTP as well.