The WW and Oswind should be perked for the same reason the 262 is, they just didn't make many of them.
Most of the German mobile AA was truck mounted and suseptable to destruction from the air by GUN fire, both the 37mm and 20mm guns were truck mounted and later halftrack mounted, the WW and OW were tried and found to be too expensive for the results.
I think there is a bit more to perking 262s than based on their number.
Wirbles and Ostis, take out their turrets. Wirbles do seem to sometimes take an inordinate amount of hull damage to kill, however. Once the turret is gone, they're hard to finish off.
wrongway