From what I see, it might be the same as other say, but I can't read it all.. I see that his trot is the same as any other horse when excited with the weather. He has not fully engaged his hindquarters and he is on his forehand.
The one sidereign use is not good, it really makes him bend outwards and as there is not equal pressure from both side, and its too low he is confused and keeps trying to escape but doesnt get comfortable anywhere.. I would loosen up the sidereign and put both on. He has a good trot that will build into something beautiful one day..