I just looked at your data and it appears to be what I have seen. The Echo seems to have between a .35-.45 voltage drop of some sort? So when the house bank is below its limiting voltage of 14.4V the Echo is usually outputting about .35-.45 volts less. It is interesting that it only had to limit the voltage once at 11:20 #1 and it capped it at 14.1volts and was outputting only .38A.
11:20 #2 Your seeing 14.4V input/13.97 Out .18A= .43 VD
12:20 #1 Your seeing 14.73V input/14.38 Out .1A = .35 VD
12:20 #2 Your seeing 14.38V input/14.03 Out .09A= .35 VD
12:20 #3 Your seeing 14.06V input/13.69 Out .04A= .37 VD
As I mentioned it looks more like a voltage drop of some sort rather than a true electronically controlled or dictated "float"... 0.1A acceptance would put any good charger into a voltage float mode and we're seeing over 14V at just .09A of current? Not really a true float?
As I said the manual is odd, and so is the information, or lack there of, behind it. Either way still a good device and even if it was doing 14.4 it would not "ruin" batts but I still don't see it doing a true "electronically controlled" float voltage...