I have NEVER heard this lobing issue we all hear so much about from horizontal centers. My VP100, 150 and the 180 I borrowed for a week all had the same sound on and off axis. However at my off axis positions the sound was not as loud, usually reading a couple DB lower on the 'ol RS meter. The VP160 does not exhibit this SPL reduction in my room at my farthest off axis position.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70