If you are training for speed, there really has to be a more dynamic extension of the arms. Opening of the arms is slow and controlled, as it should be.
Your balance position is good during the glide, but body seems stiff when you break profile. Your legs drop in a diagonal line with your body creating a tremendous amount of drag when you raise your body for a breath, also, your feet are creating a lot of drag too, they really should be streamlined, and not hanging down when gliding after propulsive phase.
I think you need to be more flexible in your lower back going for air enabling the legs to remain behind the torso and reduce drag before you kick. The timing of starting the kick process is crucial to maintain momentum and speed too.