Hi Zup!
I've been thinking, how about a little palette swap for the Allied planes? IMHO, the Spad deserves a better place and should be where the Nieuport 17 is right now. Historically speaking, the Spad-7 allowed the French Air Force to fare a lot better than the RFC during Bloody April of 1917 as it could go toe-to-toe with the Albatross without much problem and it's Spad-13 successor practically went hand-in-hand with the Camel and Se5a in shooting down their German counterparts.
In place of the Spad's current tier-3 location, why not replace it with a Sopwith Pup or Tripehound (triplane)? Methinks its just a "simple" palette swap and no need for the change of stats - pretty much like how the DH2 replaced the Sopwith Camel at Tier-1.