The well casing is an available electrode and it most be used. The
Grounding Electrode Conductor to water pipes is sized by 250.66 and
should be #4 for your typical 200a service. Since made electrodes like
ground rods are not really that effective, you only need #6, no matter
what the service is. The wire to the isolated interior water pipe is
only bonding the pipe, you should be bonding to the house side of the
plastic so jumper around the water softener.

Thought so. Will do. Thanks!