Sundog, there is NO way that the Dora-9 will be a perk fighter.As mentioned earlier, if the Dora became a perk fighter, then a/c like the P-51D, Me 109G-10,La-7,F4U-1C (some say N1K2-J) would have to be perk fighters as well.
German pilots relieved it to be at least the equal of the P-51D, and although there are quite a few differences in handling/performance at various alts, an objective observer would regard them as roughly comparable, with the D-9 perhaps having the edge under 22k, and the P-51D having the advantage above that altitude.Why then would it be a perk fighter?
The reason the Tempest is a perk fighter is that it was arguably the Allies best low-med alt fighter, with excellent acceleration, climb, & maneuvrability.Whilst the Typhoon was an excellent air superiority fighter at low alts, the Tempest remedied many of its performance short-falls at higher alts.Although it could not compete with a 109G-10 or K-4 at 'nose-bleed' altitude, at medium alts down, it was almost unbeatable, the only German fighter able to compete at those alts being the Ta 152H, and we know that only very small numbers of those were built, so it's really a moot point.