is this at 2000-2200 rpm under light throttle ? If so, seems to quite a common "feature" - VW "fixed" mine ( and it won't surprise you to know its still there )

Current car - crap mk5 & 2008 A4 avant s-line
Previous car - crap mk4 1.8T
Prior to that - 2xmk2s, a mk1, a Beetle
Getting a bit samey, ain't it ?