I work at one of our museums displaying this aircraft in Sweden F15 Hälsingeflygflotilj (the 15'th airwing)
I've spoken to quite a few former pilots of this aircraft, and you can get this big bird stopped in under 500m, all the way down to 350m under the right conditions and using the right techniques. There were a few different techniques they used which slowed them down quicker and almost as quick as the standard AOA 15.5 landing. e.g Doing a aerodynamic braking and using your main brakes at the same time, that technique could get it stopped in around 600m. With out reverser, Because for the reverser to work the nose wheel has to be on the ground.
The technique I've been told by several of these pilots was one they referred to as (Hängmattan) or hammock approach, they would come in at a higher AOA 16-17~ but much lower and touching down a lot softer, because if you would touch it down at the same rate as in 15.5 AOA approach it would slam the rear of the airplane into the runway at AOA 17, due to the suspension compressing so much and the rear being so close to the ground already at that attitude. Using this technique with low fuel level they got it to a full stop in less than 400m. The 500m landing and 400 takeoff is more of a public figure, if you push it as you can see above you can do some pretty bad ass stuff with this airplane.