S!
About the DM.Much is contributed to net lag and ping times.When a good night occurs to me with little lag or very good ping(below 200ms),the DM seems to be "better".I have almost no packet losses even at high ping latency.
About the damage.P51 was known to have a weak radiator,it was placed under/behind the pilot.Especially ground fire was not good for P51(ETO,Korea).So any shots from low 6/12 should kill the P51 radiator,even with lousy MG's,with cannon no doubt.
Niki seems to be tough one to kill,but engine and tail seem to be it's weak spots.
P47.Aim for wings.They fall off pretty easily and the tail ain't too sturdy either.
P38.Tail definitely.Short burst from MG's kill it.
Zeke.Flying Zippo,so place good hits all over it

F4U.Tail again.Very durable fuselage,but with no tail doesn't fly that well anymore

190.Get one of Yer golden bullets to the engine and that's it.

109.Radiator(engine in general) and tail.Seems to be most vulnerable parts.
F6F.Tail again.No question it is the weakest part.
IL-2.Engine from low 6 or wings and of course the tail if You get it off before the 12.7mm rips Ya apart.
B26.Wings and tail are weakest spots.Also a good high 12 HO kills the pilot pretty easily.
B17.If Ya get the B17 napping and get a good HO,the pilot dies or it bursts into flames and dies.Otherwise quite tough bird.
Lancaster.HO or slashing attacks from below/above.Wings are weakest and especially the twin tail

Ju88.Wings and tail.Pretty easy to kill in HO,because of the glazed nose.
TBM.This sucker dies easily because of weak tail.Shoot it off and watch the desperate fireworks

Spit.Weak wing and engine,also tail section seems to fall off pretty easily,even with MG's.
PT.Dive from zenith and shoot the middle section,blows up nicely and can't shoot at Ya.
LTV's.From above or behind.Not experimented best technique yet.
In general the tail seems to be weakest spot on ANY plane,so a good burst or snapshot can do the trick.