I think it may be a question of ability. In my dissertation I used a 4.5 minute rest from 3RM Squat to a flying-20 and found potentiation. But although I was using international jumpers and decathletes, there were no international sprinters…
I origianlly wanted to look at a possible potentiation effect of overspeed, but there seemed to be a real lack of literature.
Have you ever considered using some contrast in a competition warm-up? (Facilities allowing)