It wasn't necessarily too fast, as far as your actual speed.. but it was too fast for that arena IMO. Plus, it made you come out of your first couple lines pretty deep. But then you let him leave out strides at the end, and it was borderline sloppy (for lack of a better word). It wasn't terrible, but I think especially in that arena, I would slow up a bit and do the regular strides.
It is hard to tell, but I believe you are taking back your release too soon most of the time... press your hands on his neck and make sure you don't come back too early and pull his mouth. Especially at jump 7, the oxer, he really went for that long spot... and if you watch the slow version it seems to catch you off guard maybe? Your hand comes all the way down by your knee, then pops back up.
You horse is pretty cool, and seems to love his job!