If you haven't already done so, consider removing the regulator wires from the black connector and installing them individually on the VR pins. There can be loose connections with the black plug and you can't easily feel that. Installing the wires without the black connector lets you feel how tight the connection is and also they go fully onto the pins which is not the case using the black connector.
Consider adding a dedicated ground wire from the VR mounting screw to the battery negative.
If you have the VR under the panel, consider nut plates and stand-offs to make changing the VR quick and easy.