Im not going to comment on the first video (I think it's the same on you have another thread on?) but I think it's the best out of them all.
Please don't take anything I say as offensive. The barrels video just shows that you need a lot more work to be running speed events. These are old though you said, so maybe there has been improvement since (If I remember right you placed high in barrels at a gymkhana recently?). From that video though, your turns are sloppy and you didn't finish the pattern. Your upper body is very unstable and if it's going to cause you to yank on his face, stick to slower work. The poles I'm just not going to critique at all because that was a disaster (Every pole run of mine looks like that so don't be upset lol). You definitly have a quick horse, but you need to harness that energy and make sure he listens instead of just runs. My horse is the exact same way. He would run until he keeled over and I need to make sure his focus is on me.
Your horse is cute and has potential, just like I said you need to harness that and give him the tools he needs to improve.
How long until you think your knee is healed up? If that is the reason you are unstable like you say, that is going to make a big difference.