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That means you did good. Probably some slight oxidation on VM and gen lite connections. If so inclined, you can probably bring VM up a tick by refreshing under dash and chassis grounds. It don't take much - 1/10 volt makes a slight difference on voltmeter.

Those are reasonable voltages on charge. Rear is a bit high,, but I would leave it alone. 2 batteries in series @ 29 volts shows that your wiring between them is doing it's job. Re Dash voltmeter - as a quick check, I would pull it and temporarily wire it across batteries with your voltmeter too...

25 in tandem is low - should be sum of individual readings, so something is still buggered. (13+ and 13+ is 26-27) Get exactly what the 13+ is. Volt gauge may be ok. I would hope it reads low end of green zone below 13.6 or so. Proper charging voltage range is 13.8 to 14.2 depending on...

I consider those clamp on cable ends a temporary repair - a patch job. The copper continues to oxidize and there is trouble down the road. For a permanent repair, I carefully clean, flux and solder the connection.

This is what I believe you should have. From your description, does not seem that you do. There should also be a solid ground from engine to chassis or directly to battery so starter gets full 24 volts. Pictorial diagram showing charging circuit wiringas depicted in the TM 9-2320-289-20...