Here a vids fo me riding my BOB. If you listen well to the braaapp of the throttle when i get back in the setup wake that will give you an idea of the time and the size of the setup wake.
Like lil D said, a shorter wake is better. Im not 100% agree about speed. I saw ratti riding in Sarnia and Belle river and he ride fast and HIGH. Get more speed when you will over flip like landing constantly on the back of the ski. Last spring I was doing almost the same thing as you and I think you tried to hit the 2nd wake, make sure you hit the first, really easier. Here another video of the comparaison im talking.