Keep in mind that as you speed the boat up, the wake will get flatter and be easier to cross. My advice would be to go back to 15 or 22 off and start speeding the boat up. Unfortunately, without a speed control system, it'll be hard for you to get a consistent pull. What part of the country are you in? If you're new to the sport and looking to get into it, there may be a baller on here that could help get you more involved, coach you, and get you behind a nice boat with Zero Off on it. But like I said before, if you're having fun and thats your goal.....nothing else really matters
And at your age, your top speed would be 36 mph in a tournament. It slows down to 34 when you turn 35 years old