Goundwork goundwork and MORE groundwork
Sounds to me he is less wild and more dominant. I'd start doing some of the Parelli Seven Games. My horse was dominant and that helped him realize I am the lead/dominant horse, not him.
The Seven Games
1) The Friendly Game....being able to toss the string on the carrot stick (kinda like a lunge whip but NOT the same thing) on every part of the horses body without them thinking you are going to hurt him. Then start intruducing other things like plastic bags, and so on
2) Porcupine Game.....being able to slightly touch the hindquarters and being able to have the horse turn on the forehand and move from your way....same with the front...being able to touch the neck/face and have the horse turn on haunches and move out of your way
3) Driving Game....almost the same as #2, but you aren't touching the horse. Be able to back your horse up, turn, and so on with NO contact whatso ever
4) Yo-Yo Game....being able to back your horse up by simple wiggling a finger and then be able to bring the horse back to you
5) Circling Game....being able to "lunge" your horse (using the word lunge as an example but it isn't really lunging) around you in a circle (on a line or even without one) without you moving at all
6) Side-ways Game....being able to make your horse go sideways by motioning with your hands (no touching)
7) Squeeze Game....being able to take the horse between you an an object without going behind your back.
If you can master the first 4 games you can do all of them for the last 3 is just take offs of the first 3-4. Those games have improved Sonny's behaviour soo much. He listens sooo much better and just wants to be with me and make me proud of him.
If you want more information about the 7 games drop me a message...I'm not going to go through all the details in here cause it would take too much room and I doubt everyone wants to read it (or even cares for Parelli)
But defiantely just work on groundwork in a roundpen or someplace that isn't too big.