at what speed do i make circles with the 109?

[Danelov]

But maybe you could say it's a compensation that the Spit can't simply go in a dive cause it's engine would cut out. Hard to say...

Yes, the thing for the Spitfires and Hurricanes is entry in this Spit S fast and clean, quickly and dont loss too many distance or energy before the dive. That take some practice but with the time that come near natural.