Did you try ipconfig /release and ipconfig /flushdns before resealing the snapshot? Ether way I'd suggest refollowing
Creating an Optimized Windows Image for a VMware Horizon Virtual Desktop | VMware
its been recently updated and its much similar as you basically just install the agents and run the OS customization fling. the only reason I wouldn't just try a new one if you did substantion customizations to the parent image.