When you do get back, double-check if your render setting for Gc is set to 2.2 and which VSS version you are using.  PR3 had pretty much become the standard, but there is a VSSPR4 which automatically compensates if render Gc is active.  These nodes should also apply to the eye textures.  Also, have you considered using IDL instead of IBL.  Rendering will take longer because of transmaps and reflective surfaces, but the results are worth it.