heres a orthog/perp view of the model.
ive looked closely and the angle around the entire model is quite low, angle wise. it shouldnt be producing such drastic results
by the way, i just tried merging geo/ duplicating geo / mirror geo, and deleting the inner verticies, and it said this:
"// Warning: Some selected vertices have complex edge attachment; Delete Edge/Vertex removes selected vertices and related edges //"