You and your horse look awesome! You are a beautiful rider!!
The only thing I could critique on is that one oxer that you said you didn't get the striding right. Every hunter/jumper knows that there is bound to be one of those awkard distances every ride
However, I have found that to avoid those triple-sow-cow distances, it really helps to kind of hug your horse really tight with your legs when the horse should take off. Rather than jumping ahead, which most of us are guilty of, try signaling your horse: "We need to take off now!" With a firm squeeze, not a kick though. Imaine you are almost using your legs to lift him off the ground.
I hope this helps