I don't know much but I would like to take a stab at this one and learn something myself in the process.
First off, I think that your BnZ that you are using here should be at a higher altitude and maybe extend it out farther. There are quite a few guys higher than you with more E. You are lingering down to low for to long.
Second, you did a good job around 2:50 in the film forcing an overshoot. You had him but you nosed down instead of nosing up and rolling over to find him. He was right underneath you. By going down you picked up a little speed and that flat turn/split S type move you made gave him some distance to turn back into you.
You had a nice move around 4:22 when you went hi, a hi YoYo kind of, I think, but you didn't complete it and drop back down on him. You lost site of him and gave up. If you had used some rudder to nose down that may have worked. You were at the point of stalling, I'm sure it would have been tough to drop back down.
I think you did a fine job flying that 38 and getting an advantage back a couple of times by turning with him.