Since VoiceCentric includes some spatial effects and when using mono-to-stereo component, converts mono to stereo, I would recommend processing any additional EQ and compression of your Vocal signal before the VoiceCentric Plugin.
It is a matter of necessity. Indeed this plugin eq’s and compresses, but in a very specific way that Greg Wells designed. it might not match your source material and definitely will not treat any specific tonal or dynamic issues you may be facing - for that you will want to use a good parametric EQ or compressor.