I agree with more respect training, and if you are one that babies horses, you need to quit it. By that I mean a soothing voice saying "don't be scareddddd" or "you're all righttttt' as that tone of voice actually makes a horse worse, and telegraphs to the horse that you are not its leader.
A brisk, no nonsense voice works best, and don't take your mind one moment off the task at hand.
To help with basic respect, and the horse looking to you for guidance, something else you can do is when haltering, leading or unhaltering, entering/exiting stalls, is to stop before any forward movement is done, and ask horse to back, and then stand still. When walking, change your speed up and also just stop and stand. This makes horse realize it has to adjust to you and your wants.
As to the hosing? Horse is doing this because he is ignoring you, and the longer this goes on, the worse it will be. If it was me, I'd use a chain shank, or run lead rope under chin for some bite to rope, and get after horse more, but don't know how well you read horses, and if there isn't someone there to teach you it is not something to do on own.
Also, several things jumped out at me. You do not seem to be able to read horses well, as they will let you know they are up to something if you pay attention. A certain lightness in their body, eye focuses somewhere else instead of on you, ears pricked all are signs of horse getting agitated.
You should be in no location where horse can either pin you, or hit you with head. That tells me your body mechanics are lacking. Pay attention to all of your surroundings, not just the horse but what is behind you, beside you, on other side of horse, and pay particular attention to what else is going on, in terms of other people, cars, dogs, horses, whatever. That awareness right there, has saved many horsepeople from getting themselves killed.
And if you are not working horse in smaller area, (as when you said you attempted to canter him for first time wasn't clear if in pen or pasture,) you are asking for a major accident. And need to lead up to it longer too. Many horses will not really let loose on a rider, until the canter. It feels very different for one thing, and if you are in open? You can have a nasty accident. Hold off on that until you have a better handle on this horse would be my thoughts.
Horses make me a better person.