There is not enough energy store to run the 100m full throttle and carry through to the 300m. The technique/mechanics is still the same so less force/throttle is applied.
I probably don’t know the traditional strategies you are referring to. Years ago when I asked a local high performance coach if he would assist me his answer was “”keep doing what you are then send the athletes to me””. Years later I asked several coaches including Peter Lawler, Norm Osborn and Mike Hurst for help and they were great, probably thought I was asking stupid questions they but never made me feel uncomfortable. (You may not know who they are and they probably have no idea I am at CF.com).
Traditional ??? If you are referring to split runs >500m the mechanics are the same, I always use the theory that once control is lost then stop and recover before starting the next rep (count that rep as finished). When using a sled distances are halved 150m = 300m, when the sled cord (3m long) starts to bounce pull out/rep completed.