I agree with this, I don't think you should sit the trot on any young horse for a pretty long time. You're teaching them to lift their back and be soft, but they often can't do that unless you give them the freedom of posting trot. Af the lower levels where you can choose to sit or post, Ive seen almost every judge say you should post. It's just good for young horses, shrug.
I disagree with your self critique that you need more haunches in; I think he frequently looks crooked through the neck like young horses love to do. He is twisting through the neck and looks like he needs more work on straightness. It seems like youngsters always go through that phase, I'd ride him with almost no bend to really work on that. Lateral work is great to train, but don't let him overbend there either.
If he wants to get behind the vertical, I would not try to correct it using the reins like you described. If he's trying to get behind the pressure, don't use more pressure to tell him to stop. I'd send him super forward, so forward that he has to push off the back end, every time he gets too low, super extension. Again, posting will help.
For you, you are a good rider but don't look at his head. You're better than that, look up and where you're going, stick your nose up a little if you want. When you look down, it rounds your shoulders and your spine slouches. Look at the Grand Prix riders during a passage, sit super tall and elegant, don't look at your horse, you know what he looks like :) Sitting taller will help strengthen his canter too, don't use your hands to lift him, resist with your core and sit tall to make him come back to you. The counter canter loop is a good tool for a young horse, keep doing those :)
For his confo critique, he's very pretty, very nice face. He not crazy downhill, you'll just have to keep that in mind while riding like you do. I'd be careful though that his saddle doesn't want to slide forward onto his shoulders because it already "angles" that way. My horse is the same way and I've found an anatomical girth helps keep his girth from pulling it forward. Maybe not an issue for you, just something to think about.
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Thank you for the input and this was helpful. But haunches fore helps with straightness going right and shoulder fore help with straightness going left. I make the transition to canter with haunches fore so he picks up the correct lead, that works with him. I think the "tucking" will get better over time, it's already improved immensely. I think what I need to start doing is dropping the connection when he feels like he's tucking and make him use himself and not rely on me or my connection to always be there for him. Consistency might not be helpful with this horse. He does it because it's easier for him, I'm not using the bridle to put him there. If you rode him, you'd feel what I mean. And in the long and low you can tell I'm not riding the face. But I agree with the straightness issue, straightness has improved but isn't super.
I also post more than I sit, I sat for the video for the sake of getting him to sit more on his hind legs, he gets more on the forehand when I post. With the canter I bring him up using my core and seat with timed half halts in conjunction with the timing of the inside hind leg to try to capture the upward momentum.
However I disagree with running him off his legs because he gets more behind with more engagement and running his will send him more on the forehand. Shoulder in, haunches in, laterals he tucks more. He pushes off his hind end quite a lot, you can see by how much he over tracks and is quite round over his back and supple.
His canter is naturally downhill. On the lunge line it's pretty downhill, worse than on video. When I saw him free lunge I knew it would take a lot of work to fix the canter. It's not going to be an over night fix and I won't sacrifice the freedom of his back or shoulder. He has moments where he sits back but he lacks the strength to carry himself uphill consistently. That will take time. Right now it's training him to learn to be up. Shoulder in at the canter helps a lot as well as leg yields.
Also keep in mind I've ridden well over 70 different horses in the last few years. I'm not saying this to be like oh I know so much but to be like I've developed a few horses, this isn't my first rodeo so to speak lol but I haven't particularly had "behind the vertical" issues. I've done multiple young horses, re-trained tbs, retraining projects, quite a lot of rehab and my horses I rehabbed were successful. One I had was a young trakehner that had something wonky (some kind of calcification) and had soundness issues but I kept him sound. I re-trained a saddleseat horse for dressage who also had stifle issues for dressage and he learned to reach for the bit, rather than fearing it and actually learned to use his back. I used to ride 3-5 horses per day and was under a primary trainer but also cliniced with a wide variety of people. Ive had opportunities to ride school masters who did GP and so I have seen a lot of the "behind the scences" work that riders/trainers do. I have also ridden piaffe, passage, canter pirouettes, tempi changes, etc on schoolmasters. I've also done warmblood inspection with babies and mares. I've also worked with colts and stallions at home and some in Germany. I was a working student/groom, you don't make it without being a good horseman.