Stunts: keep trying. I started riding stand ups in Wyoming, and there was NO ONE around to help me. I started in 2006, gave up, started again in 2009, and now have a few skis and one is a stunt hull to start learning backflips, etc. I can sense your frustration, and I too wished for more vids, comments, and even books that I could devour for more info on how to ride. It wasn't until I looked at my 1st owned ski, sitting in my garage unused for nearly 3 years, that I decided to strap on a pair and ride the beotch, full speed ahead! I can offer the following, for what it is worth...
If your bilge doesn't have an inline fuse holder, install one. My bilge also stopped working, and whenever it has, it has been the fuse. The fuse will keep your bilge from grounding and/or burning up (drawing too much amps trying to pull debris, sand, etc). Short of debris getting into the impeller of the bilge, bilges can run dry and all day long. At worse, getting a new 500 gph bilge is around $30. Get the bilge wired right, put in the fuse holder, keep a few spare fuses handy, and leave the bilge on all the time. In all my lake riding, even in heavy chop, my bilge only spat out water once. Of your hood seal is good, your scupper is taped over, and the bilge is working, ride "worry-free".
Start riding on your knees. When you are putt-putting along on your stomach starting of, lift yourself onto the tray but only get on with your knees. Trying your turns in that condition you'll see how leaning in turns will make you want to tip and wipe out, but applying throttle will pull you out of the tip over. The key here is being low in the tray... kneeling down. The lower center of gravity will make the ski feel more stable and let you build your confidence. Also, kneeling lets you change your body position and sense the difference in how your ski behaves easier. You have both knees touching, along with your shins, and your calves are pressed against the gunwales... it really helps develop your senses with so many contact points. Soon you'll feel how turns work/don't work with throttle versus leaning versus steering, etc. And with an SJ, you'll soon realize how much you need to lean over to get the ski's chines and side rails to bite in the turn versus getting it to skid.
When you stand up to practice your turning, I'd suggest slowing down instead of speeding up. Going fast makes things happen quickly when you start to loose control. Going fast takes finesse, and that comes with time. Yes, racers look like they are manhandling their skis, hanging over the edge, so on... but you are not there yet. If you go slower, you can power out of a tip over better, shift your body weight with a perception that it does more, and coordinate your throttle to steering inputs. Slow for me is right at, or even just below planing speed. That "slow" speed helped me develop a sense of balance better, and feel the ski's handling better than when I tried going fast. My brain couldn't process everything that was happening when I was going fast.
My last few suggestions are to squat a little when turning. It lowers your center of gravity a touch, and if your knees are bent, it lets you use body language by shifting or moving your legs to counter the ski's tendency to tip over. Try riding surf stance more... it imitates riding a skateboard/surf board, etc. I think that stance, when learning to ride, helps you wiggle and dance a little on the ski more than being in footholds, because when your ski start to tip over, being in footholds requires more throttle, body language, and finesse than your skills are at right now. And for your right hand turns, I too had problems going right. What I did was start a very gradual right hand turn. No intentions of doing anything abrupt or fancy, just a large right hand arc. It usually ended up being, "tip-turn a little, gas and straight, tip and turn, straight again" and so on. I thought the Queen Mary could have made sharper turns than me. But the key to that was developing my sense of balance, throttle, weight shift, foot position, steering input, pole position by processing each one of those one at a time, then putting them together. Example: start gradual turn, what does tweaking the handlebar a little do? Ok, after that, what happens when I goose the throttle? Did moving my feet forward or back, side to side help? Did squatting a little work better? Doing things that way let me incorporate all those details into fun turns now, only 2.5 years after really getting into riding! Then, as your confidence builds, decrease the arc of your turn. At some point, a light will come on and turns will be fun and second nature. But go slower, take little bites, and just smile when you are riding. You'd be amazed, but smiling really does help. Have fun!