I would say if fight is at Spit 9 best alt (25k), only option for Dora is to dive away. Pilots with equal skills should really be a stalemate. Spit pilot will stay as close to 25k as poss, 190 won't get suckered into high alt or turn fight.
Be interseting to see Urchin, low alt I would prob agree, hi alt 20k+ I would give the Spits the advantage. Only option for Doras is boring extends etc. If the spit pilots fly smart and get to around 25k, definately give them a big advantage.
By capping the Spits to 15k your taking away the advantage they have. Remember our Spit 9 is hi-alt 25k version. Would be like having a Spit v LA7 scenario and forcing the LALA to stay above 25k.
Shame we don't have Spit Mk8, definately know who'd win then
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68DevilM - Spit14 is purely high alt plane, it is outclassed low down. Not worth the current perk value. Although a little more expensive Tempest is far better, goes like a bat outta hell and has awesome (Hispano 2) cannons.