if you've really dialed in the vta, i'd suggest you need to mess with the azimuth. rcprince also makes a very good point, tho slight sibilance produced by the "variable vta's" of less-than-level platters can be at least partially ameliorated by making sure all other variables are correctly set. plus, don't get hung up on a single lp for testing. i use a variety of music but particularly rely on more-or-less unaccompanied female voices to adjust vta and azimuth.