ZBrushCentral

Symmetry Problems with Mesh

Hey Im having an issue using the smart resym feature in Zbrush. I need to retopologize my mesh but i cant do it accurately because the zsphere does not start centered in the model when i rig it. Also somewhere along my saves some symmetry on the mesh became off, so that even the symmetry tool is no longer correct. when i tried to use smart resym, it just started counting up (the cooldown on it) and got slower and slower untl it finally froze with like 120 minutes on the cooldown, when the timer had startd at a 4 minute eta on smart resymming. Could it be because I have too many polys? bad geometry hidden somewhere? should i try a remesh first to attempt to drop the poly count? any help with this would be appreciated!
Slootha