Spit 8 is perked since there are plenty of spits - good spits, to play with free and so there's something for the spit drivers to spend their perks on.
Spit8 is perked because it is good allover. Its main feat is yo be faster than a spit9 and conserves E better. Its a pretty fearfull boom and zoomer and can escape/kill the faster planes in MW with tight turns. It has extanded internal fuel compared to a spit9 and is very suitable for high cap. I wont make a complete plane description as Kev is way better at that, but IMO its the best MW fighter.
AND BTW I'm a sissyfire noob vulcher ramer HOer and the rest

Proud of it
Our mossie can't be a perk plane seriously, its mainly a ground attack plane to me, even if you can still make good boom and zoom in it, but 1 ack hit will most of the time put your plane in fire, or wound/kill your pilot. I use it for gv hunting personnally, its perfect to divebomb flaks and has a good climb speed when heavy. But a good pilot in a single engine plane (or P38) will kill you.
P-51B is a great ride (fast, stable, good rolls, lots of flaps levels), but spit8 food (muahaha), you can't perk a gun package that low. Nobody would fly it anymore. Straffo You got X kills with it because you are good (yes he's a squaddie), and your main ride is yak9u, wich has even fewer ammo and firepower. No wonder you can get lots of kills in a 51B.
The typhie really dominates I think, guns, speed, loadout, turns like a brick on first approach but with some training you can do surprising things in it (ask Coach).
See you guys on MW this week end