Battery voltage drop

Wasn't able to get any readings on the way to work, so I took them after I made the drive home:

Power off: 12.5v
High idle: 13.9v
Ungrounded tab on high idle (green): 1.3v
Grounded tab on high idle (blue): 2.3mv

numbers seem better after a real drive, rather than just running the car for 15 min after a cold start. i was on the road for a good 30-35 minutes.

screws mounting the VR to the firewall are pretty clean. so are the other grounds.