It's not clear what would cause the voltage to be different. An old forum post
http://www.theenergydetectiveforums.com/index.php?topic=624.0 may be related. If it's as random as that post seems to say, I could try putting in a configurable multiplier.
Can you make your Ted Pro available over the internet? If so send me the connection information (and not the mailing list). I'll try to look at the data and see if I can see anything.
There are several options to control the imports, including:
-i,--import-interval <arg> seconds between imports of data, or 0 for only hour-long imports (default 4)
-e,--long-import-interval <arg> seconds between imports of whole hours, or 0 for only short imports (default 300)
You could try "-i 300 -e 1800" to do a "short import" every five minutes, with a "long import" every half hour to find anything the short imports missed. As you can see the defaults are much more aggressive. I'd be surprised to hear that there were substantial issues with processor load.
Robert