FTJR,
I think that the Mosquito B.Mk XVI is worthy of being perked due to the fact that it could, in AH, carry a 4,000lb bomb at 416mph or 5,000lbs of bombs at ~385mph. Those speeds make it very difficult to intercept, no fighter will be able to see them and then climb to intercept them. An intercepting fighter will need to be in, or close to, position before they are spotted in order to have an intercept chance. Remember, the Ar234B was completely unarmed when it was introduced and for most of its time in AH, it is still functionally unarmed.
Soviet,
The He177A-5 would be the best overall bomber in AH. The B-17G would rate a distant, very distant, second with the Lancaster and B-26B vying for third. Sure, the B-17G has better defesive firpower and the Ki-67 is faster, but as an overall package the He177A-5 would be far better.
That is the same position the F4U-1C was in. Being in that position would cause the He177 to be used vastly more than any other bomber and quite likely more than all others combined. If you'd take your blinders off you'd see that a bomber with that many of the cards would dominate the bomber stable if unperked. We're not talking about "giving the Luftwaffe a good bomber to compete with" as there is no Luftwaffe, just Bishops, Knights and Rooks. So when we compare the capabilities we need to be objective and being objective tells us that as an overall package only the B-29A would be a better bomber than the He177A-5 because AH doesn't model reliability or production numbers.