I'm not too far removed from where you were, and really not all that far past it either.
- It amazed me how much physical effort was needed and how hard I needed to work to make my first pass at 15 off/28mph, when people were making it look so easy. People are definitely working behind the boat and it's way more than you think you need.
- There's a big confidence hurdle to get over. People can tell you all day about the only thing you have to worry about is body position, but if you're not confident enough to really pull hard through the wake and feel safe doing so, it's going to be hard to get. Granted they go hand-in-hand; if you're pulling hard in a terrible position you can either hurt yourself or take some bad falls, which only lowers confidence and works against you. Getting past this just takes time. This can be worked on out of the course, not doing pullout drills but wake crossing drills.
- Turns matter. Again it's pretty commonly said that if your position behind the wake is good, you can do anything you want in the turns and still run these passes. Maybe that's true if your position was that of someone that can run 32-35 off. It's definitely not true while you're still building up to that position. That said, don't get caught up focusing on a bunch of different things. Mostly it should be a couple simple things getting started. The biggest culprit is just figuring out the balance you need on the ski. Likely you're too far on your back leg, especially offside so you're not finishing and getting pulled right at 3 and 5. Stand taller with more weight on the front of the ski. You'll run plenty of passes where you're too much on the front and lose the handle or get pulled out. You'll get there.
- Another big culprit in the turns is just being narrow and/or too slow at the buoy, which could be because your pull between the wakes was bad, which might be because something before that was bad, etc. All the pieces work together and it can take a lot of time to get it right.
- The course seems so long and it seems like you have so many places you can either mess up or have time to fix things, but the importance of getting a good gate & 1 ball can't be overstated. Getting a solid 1 ball can just make everything else fall into place, even when you're still working on your first pass. You should be able to learn the course starting at 1 ball, but make sure you are wide of it and finish your turn in at the buoy instead of riding right after it and turning after you pass it.
Keep at it. You've got the will to progress, boat, water time and equipment. It won't be long.