I'm not very savvy when it comes to all these terms.. but I think "Wing Loading" would be a better place to start. An aircraft with a low wing loading (larger wing area, more lift, slower speed. Think Spitfire/A6M) will turn better than an aircraft with a high wing load (smaller wing area, less lift, faster speed. Think 190/P51)
I highly doubt the 110 and A20 were that maneuverable in real life.. though the A20 is a bit more believable than the 110, I think you could say they're the true UFO's of AH's flight model.
At 1:57 you see Junky is trying to turn hard left into the P51, while he's doing this left turn he also does a bit of a left roll that puts him below the 51. The decision by Junky to follow him like he did allowed the P51 a brief moment to get his nose around for a quick shot, as you see in the film. Had Junky not followed the P51, and instead opted for a high yo yo or any upwards vertical maneuver other than the downwards maneuver he made, he would have denied any gun solution the P51 may have had, and been in a much better position above him afterwards. If timed correctly this maneuver would have worked on a N1K, Spit.. no matter what Junky was fighting against.