Sorry, but without a sound clip, this thread is pointless. Everyone has a different opinion of what sounds good.
Your issue below 3,000 rpm is probably drone if it's a low frequency bass sound that is annoying to your ears and head. Although I find it strange, some people actually like drone.
1989 E30 M3/Zinnoberrot
2011 1 Series M Coupe/VO/Fully Loaded/Bloated/Stoptech ST-40 Trophy Street