Pacman, I took a look at your score and stats - and I don't see a large number of death's to Spitfire's. Do you mean 1v1 as in duels in the DA, or do you mean 1v1 as in "flying in the MA and chance on another Spit"?
If it's the DA, then I'd ask the pilot who's killing you how he did it - and of course, film it and view it from both sides.
If it's the MA, then personally, I wonder if what may be happening is that you are good enough that losing to another pilot in what is obviously is your plane is a bit of shock. Some of the better pilots are good at hiding their energy, and making it appear as though they aren't nearly as fast as they are - are they doing a climbing spiral as you engage?
And of course, filming it and viewing it works in the MA too.
<S>