still having problems, need advice please

Checking from the actual battery post is the way to do it. That's what the battery "sees". So you're good there.

Nice that you are checking grounds to Neg. post. Most folks ignore that part of troubleshooting.

8v on + coil post is o.k. In actuality, it's a 6v coil. It'll run on 12v but, not for a long time.

Your regulator may need to have the case grounded. I've got a '75 Dodge, ran a ground wire from the mounting bolt of the voltage regulator all the way to the negative battery cable ground. That did make a difference in voltage output. But, I've got rust problems on my vehicle that affects grounds.

What type of meter are you using for this?
Analog, digital Fluke, etc...?
Reason I ask is because with an analog there is a test you can do that can't be done with a digital.(least it never worked that way for me).

Dual field regulators (Mopar) run a constant 12v to one side of the alternator field. Is that what you are getting?