Wow... more lies.
Spit9 as-modeled (in-game) outclimbs a P-51 across all alts, is pretty close to Ki84 and C205 up to 9k then blows them away, and where most of the planeset makes around 3000fpm climb rate on average, it's doing 3800fpm up til almost 10k.
For somebody that pretends to love spits, you sure don't know them much in this game. Either that, or you do but you pretend they're inferior so folks don't fly them as much?
Let's compare some more:
Blows away the F6F, F4u1, Yak9U in climb rates at ALL alts.
Almost 2x better climb rate than N1k2 above 6k, can't quite match 109s below 6k (but the 109 is pretty much considered the best climbing family of planes in the entire game, not a fair comparison, right? But wait there's more!) but still matches or surpasses the 109G2 and G6 above 9k in climb rate.
Let's try some more:
P38J, Typhoon, P47D40, blows them all away in climb rate.
Yeah, so
clearly the spit9 can't outclimb anything in this game, as Karaya states...