One thing I noticed is, you tend to fly gun piper right on him. That will present you with only front quarter shot. When He try to engage a rolling scissor at 1:31 you have speed. Instead of going for the shot straight away by keeping the cross hairs on him, pull wing level in the vertical, locate him in your top/rear view, rotate your lift vector and drop back on him. Wash, rince and repeat until he runs out of E. Or try to lag turn him to saddle him up. at 3:01, your 100mph faster and dropping on him, yet you fail to capitalize on your E advantage and pull for a gun solution. Roll wing level and pull straight up. locate him and drop back on his 6. At 4:38, He chandel right to drop back to you. Your still flying gun piper on him. that leave you with a front quarter shot. Only then you decide to use vertical to gain a position on him. Another thing is that you extend waaaay too much. There is only 2 of you. In that situation, commit to the fight, be aggressive. Drain him out of his E and drop in for the kill. You extented to reset when you didn't need to. All you were doing is cut him some slack so he can try and rebuild his E bank. You had the advantage from the get go.
Pull straight up and rotate your lift vector. When he gets around 800, it's time to drop back. You shouldn't get much further than 1.2k out. That wont leave him no choice but to keep defending until he runs out of space. Don't stop until he's on the deck.