A few larger cameras, such as the Nikon D3X, will not allow you to perfectly center the height of the lens to the midpoint." Isn`t problem for perfect panorama?
Doesn't matter as these heads are designed for larger lenses for gigapixel panoramas so you don't care to be at central point as nearer points you shoot are really far !
Can i create panorama 360*180 in interior no problem with Epic Pro? Don`t absent you portret gripping?
As said previously it's impossible to shoot a whole spherical panorama with Epic Pro or Panogear, due to large mechanic at bottom of head ! If you need to shoot whole spherical for interior, smaller lenses such as 14/20/30mm will be well enough and manual head will fit fine !
My shop for panoramic photographs: http://magasin.skivr.com
Nodal Ninja 4 R-D16 on Benro Tripod + Ultimate R1 on Nodal Ninja P2 + Nikon D800 + Nikkor 10.5 + Nikkor 14/24 f/2.8 +Pentax 645D