If they are pulling a tight, low speed turn to evade, they are surrendering to you and you should kill them every single time this happens.
Good. This looks like an opportunity to get a tactical clue.
I recognize, first, that when they are slow, yes, I have an advantage and can take a snapshot. Even if I miss, I can pull up, loop and reverse, and make another pass. I'm not sure if my problem with most of the F4U's I've run into is with the low-speed turn or with my inability to snapshot 'em to oblivion. Is my assessment here wrong? I should, given the initial advantage, be able to repeat as necessary, correct? It seems like the F4U runs pretty well though, and will only give me one or two attmepts t o get this right - or is there another tactic to employ when you're coming in high/fast on a low/slow turner? My first guess (after reversing and repeating) might be a high yo-yo (especially in the 190D) but it's a hard maneuver to judge for a relative noob.
For all those who might get defensive, no, this is not always how I've encountered F4U's. Indeed, one of my first kills in a 190d-9 was over a Spit all out of place at 20k whose wing I blew off. As I followed him down to really enjoy my kill and pump a few more rounds into him just for laughs, I was swooped by a high / fast F4u. This sort of "ruined the party" and resulted in a pw and damage, first pass, and death on the second.