It could just be a valid maneuver that happens fast enough to seem much faster with the update interval. Sometimes the smoothing makes it appear much faster than it was, simply because the smoothing code normally does't interpolate well between positions that change direction really fast... it can't.
Unless you can show me that there is a flaw in the FM of the 38, I'd say it's just a valid move that the smoothing code and the positional updates can't quite keep up with. It's no more gaming the game than rolling quickly in an FW. Sure, I suppose it can be exploited, but how do you "fix" it without removing very valid moves?
A film would be great, it would be good to see exactly what you mean.
Just remember folks, that with quick reversals of any kind, you may not see all of the maneuver. There is just no way around that. When in a knife fight at low speed where these reversals are common, you have to be flying your plane and planning where he will be, not reacting to what you see him do. It's always been this way for me. Especially the 38's seem to exhibit this behaviour simply because their design works well for very low speed reversals. If you watch, you can see a good 109 or FW pilot sometimes get the same effect. I used to see it more back in WB, but the same thing happens in AH, although to a lesser extent IMO.
I'd really like to see one of these from the 38 pilot's point of view and from his opponent's. That would be very interesting.