Keep it up with the weight loss.
In my experience, common errors/misconceptions causing failed deep water starts:
- driver hitting throttle way too hard. You want a very slow gradual pull, probably slower than you can imagine. I always see skiers having this problem thinking they need a faster/harder pull but then having much greater success getting up with a slower softer pull.
- vertical ski / weight on the back foot. This will result in a deadlift tug of war battle with the boat which you will not win. You want your body curled up into a tight ball, knees to your chest, and your back heel pulling up toward your butt to remove the weight from your back foot, putting ski at roughly 45 degree forward angle so that as the load from the boat increases you start going forward and upward.
- bent elbows trying to pull handle toward you. Keep your arms out straight!
After that it's an act of balancing on your front foot while curled into a ball until you gain enough speed to stand up. Good luck!