Are using any kind of a beam blocker on the V30's? If not, that would help. The speaker your probably wanting is the G12H30 or eqivilant. It's midrange empahasis is shifted down compared to the V30, but still somewhat similar in most other respects, including bass response. Mixxing G12H's and V30's is the right solution for many.
I'm sure Lew could give better answers too.