I removed my new wfco and replaced it with a Progressive Dynamics. As stated many times, I think that a lot of wfco converters don't work properly even when new. I know that mine did not. I ran my battery down on purpose by running some 12 volt stuff in the backyard. No matter how low I ran the battery, the wfco never charged at more than 13.6 volts.
I got a crazy price on the new PD and it took about an hour to install it. The new PD started at 13.6 volts and then jumped to 14.6 in a couple of seconds. It stayed there for a couple of hours and then switched to lower voltage.
This was the first modification I did to my new TT when I bought it.