I just wanna say something about the lunge. I think you are very agressive (i'm sure that's not your goal). And this is the reason why your horse move the head and wanna leave!
The video you put before is a very good exemple, look the men is very calm, and the horse is reactiv!
You must understand that energy is not the same than agressivity... and you have a lot of energy and agressivity.
In Parelli we speak about "phases" phase 1,2,3 and 4. You are always in phase 4.
An exemple for the phases: Horse Training Games - the Yo-Yo Game Get Started with the Yo-Yo Game
The first step in teaching the Yo-Yo Game to start on the ground and make sure your horse has pretty good Friendly, Porcupine and Driving. Then you need to practice the phases for sending your horse backwards and bringing him back to you. The Four Phases for sending your horse backwards Begin with your horse’s nose at about arm’s length from you and holding the very end of your lead rope in your hand. Give your horse a "Schwiegermutter" look (means German Mother-in-Law!) like you are another horse laying his ears back. Lift up your hand and wiggle just your index finger at him. When you wiggle your finger, the lead rope shouldn’t move at all.
Close your fingers on the rope and shake just your wrist. The rope should move a little, but it shouldn’t make the halter move at all. (Keep giving him ‘the look’)
Lock your wrist tight and bend your arm at the elbow. Move your forearm back and forth. This should cause the rope and the halter to move so your horse can now feel it quite a bit.
Lock your arm really straight and swing your entire arm from your shoulder joint. You may want to even spread your legs a bit to give you some stability while you are swinging your arm. Your horse will really feel this as the rope and the halter are moving hard.
As soon as your horse takes even one little step – at any phase – stop immediately and relax your body. This is how he will know that he did the right thing. When he moves, even at phase 2 or 3, stop there and then start over again at phase 1 until he is all the way out to the end of the lead rope.
The second things is that your horse is bored to death! I think that you have to change a lot the exercices. Give him a goal, you need to get him interested...
I hope you understand what i want to say. I'm French and my english is very bad, sorry about that