I have the vp100,(under the tv) and have heard a vp150( above the tv). I felt I had noticed an improvement with the 150, and had added it to my list of upgradeitis. I was wondering if maybe it was a placement issue, but what I got out of your post makes me think otherwise. If I was to buy my center speaker over again, i would get the vp150.

Axiom M80, Ep600, Qs8, VP150, Crown XLI 2500 , DBX Driverack PA2, Focusrite Scarlet 2i4