I didn't watch the film, but if you were more or less co-E with an la7 in a yak and dove instead of following him vertical, you made a big mistake. Yak's can follow my G10 up far enough to avoid getting shot to hell, and can occasionally ping me up a little. The G10 outzooms the LA7, so presumably you could get some hits on him. Just trim your elevators to neutral (I have downward trim on Z) to reduce drag and dump flaps when you approach stall speed, then hang on as long as you can. If you can keep going up long enough that he has to flip over first, you should be in good position. I haven't done much E fighting in the Yak so I don't know how bad the stall is from 50mph at the top of a zoom, but if it's even close to being as easy to recover from as the G10's, you should be fine.