Guys, if this turns out to be a bad idea, I'm sure Hitech and Pyro will revert back to the old arena and say "We screwed up, guys. We'll come up with another solution for our MA population issue."
As it is, give it a chance, it might work out.
Also, as someone said, the 109F-4 is more than capable of handling the Spit V. Of course, it leaves very little choice in that arena. Those two planes will probably dominate.