If you think the head shaking is bad when you are manuevering, you're in for a big surprise when you fire your guns!
I dunno why you guys wouldn't like it, afterall, the gunsight moves with the head so it really doesn't effect your aiming or anything.
As for the engine noise, I asked HT way back in 1.03 or 1.04 why the engine pitch didn't change as the plane got faster but it did as the plane slowed down and he said that it was because he couldn't get it to sound good enough as the speed increased so he did it the way it is now.
I dunno if that applies to the noise as your engine struggles (in a pure vertical move when you are very slow), but I'd guess it does.
Other than that, welcome to AH.
-SW