@Charliesav7 I am a beginner course skier not much further along than you and the offside turn and body position are still my biggest problems. In order to run the course for the first time, I had to spend a lot of time improving those aspects of my skiing.
Your onside body position actually looks great to me. You are "stacked", ie. your body is linear and perpendicular to the ski and you have a forward lean in the direction of travel which is very advantageous but also difficult to achieve even for advanced skiers.
Since we don't have a full video of you crossing the wake, what I suspect is happening is that you are standing up too soon and not holding your cut through the first wake. As a beginner it is scary to be leaned away from the boat and hold a load through that first wake and pass through the center line of the boat path with a lot of speed. You need to practice hitting the wakes at speed from both sides and get comfortable doing that.
The onside turn is very forgiving of not carrying speed through the wakes and thus you are still able to make a good turn and set a good cross angle. But the off side turn requires you to carry enough speed into it that you become "free of the boat" and wide enough on the boat that you get a feeling of no pull from the rope. It is during that freedom from the boat that you force the ski to turn starting from your feet up. You should have as much weight as you can on your front foot and your upper body should lag behind your lower body on rotation. Let this rotation phase take some time so that the ski can achieve the cross course angle you want before the load hits.
For a beginner, making the ski turn on the off side does not come naturally. For me, I could not just rely on the ski carving on its own. I felt like I had to provide a lot of physical input to help the ski turn.
On final tip on carrying speed into the off side turn, make that speed early with a hard cut into the first wake. If you keep cutting hard past the second wake, you will definitely make speed into the turn, but you will also turn into a ton of slack.