let them make a few passes at you, time them to do a reverse at @1.5 out. If they point their nose at you guns blazing, you have a shot at killing them. The key here is to keep E up. I tend to do low G low yoyo's, and after they miss, I do a gentle climb to gain back potential E. Repeat this move 2-4 times. EVENTUALLY, after missing you over and over, the lala driver will commit themself. This is where you have to be quick. When they commit, i.e. not zoom up and gain distance (generally, after missing that 3-4 pass, they tend to immel hard, and are usually d1.0 out) THAT is when you do your merge, get on 'em fast, and shoot them down. You have to be fairly quick here. After they blow the merge, and figure out you are d400 or under behind them, they do some evasives (blowing their E) and you SHOULD have 2-3 good shot opportunities on 'em. Generally, this is where I tag 'em w/ a deflection shot during their evasives. You have to be quick, because when the figure out they not gonna lose you, most lala drivers will point nose down and run. The F6f has a GREAT zero G dive, and you can stay w/ 'em and possibly get a good 6 shot as they run.
How I tend to do it anyway....