I've found mine is fastest on my side. I usually take about 4-5 on free before switching to flutter kick and starting my pull. On back it's about 5-6, and fly it ranges with my amount of fatigue from 7-8 down to 4-5. But if i get too much on my stomach or back i will pop up early. and I HATE that feeling of awkwardly starting strokes early because you are on the surface.