I have done one foot starts for years and found the following to be the easiest.
-Float to position with a fair amount of tip is out of water (9"). Ski will be at least 45 degrees to surface
-Bend front knee and with straight arms and position rope handle near surface of ski (close to toe of front boot. To do this will require a fair amount of knee bend. You will also find that front leg will be securely cradled between arms.
-A little reverse back bend, engage core, hit-it, a resisting push with front leg, and let boat pull you up. Using shin of back leg as @eleeski mentioned is also helpful.
I have found that the biggest difference between one and two foot starts is ski position. If you start with tip too low, or at too little of an angle, the tendency is to get pulled forward. If you curve spine forward the handle ends up forward and so do you. One foot starts are more of a surfing up move with trick to stay centered. With two feet the tips mentioned are designed to keep excessive weight off back foot.
Just thoughts!