Im sure you're waiting for it Junky but what is a BRD?
At that time the 7B doesn't carry much energy uphill and I had a second 38 to watch for so I stayed with the one currently engaging me. Had I seen him go vert I would have put the nose down. But I typically fight defensibly. Looking at the film the other 38 was only 30-45 secs from joining the fight that last place I needed to be was slightly above one 38 with no speed and On the same level with another with no speed.
Barrel Roll Defense
Talking about the vertical I'm suggesting a more vertical lift vector(the way I put that in my original reply was wrong), this could give you the option to do 2 things, a loop/immelmen(which would be a trade of E for alt and pretty much resets the fight there) or more of a high yo yo/ rope/spiral climb (think the other things name I'm looking for is a lufberry but I may be wrong).
First option is out of the picture because of planes performance and you need to kill that P38 quick, which is what you tried to do....with too much speed, why he got inside you right there(Side note: When I see this (from point of view of the P38) I'm doing a BRD, which in short is a barrel roll to force an overshoot, sometimes it works out where the other plane tries to start doing rolling scissors in this situation and it fails because they are too far in front)
Second option is adjust your roll to the left(from level flight) and pull back on the stick(starting point of a high yo yo)....this is where it can go a few more ways depending on the 38, he keeps pulling in you can set him up on a rope(because he is bleeding a lot of e), which if you time it right you can have enough E to avoid the enemy coming in while setting up your shot on the first 38 or get that shot off prior to the other 38 getting there. If he backs off his reverse and tries to separate a bit you just complete the high yo yo and now your still on his 6 with his buddy coming from your 6 which isn't terrible because it gives you a little say on where the fight is about to go next.
Your right, the P38 does throw a wrench in the plan....but giving up position to a plane you already have in front of your 3-9 line doesn't seem right to me until -1K...most of my defense maneuvers start at 1K distance.
Good flying overall though