Lithium batteries (in particular, Lithium-Fero-Phosphate == LiFePO4 == "LFP" want to be charged at higher-than WFCO charging voltage, and the WFCO chargers also sit in "float mode" until the battery is too severely discharged.
In my opinion (and I DO know quite a bit about this subject), the best chargers for LFP batteries are from PD, and also (especially) from Victron Energy. My experience is with older WFCO products, but they've always been lower-quality products - widely used by OEMs trying to get by on the cheap. The new ones might be a bit better, but I'm not going to risk $1100 worth of batteries being "managed" by a cheap controller.
The PD Lithium-compatible upgrade charger sections for the WFCO box are pretty good, but they tend to keep the batter charged near 100% SOC. In the case of long term storage (over winter, or through more than 1 week in the summer) you should not keep a PD Converter plugged all the time. Storing at 100% SOC for most of the time cuts the maximum lifespan of LFP batteries from roughly 7000 charges down to roughly 3500 (assuming no deep discharge events).
The "MBA WildKat" over at BestConverter.com is a slightly modified PD, (modified mostly in firmware, but also with a couple of bigger filter capacitors) and I own it. (And I've bought it for other people as well, I have an RV repair "Hobby".) It was significantly better than "stock" PD when I bought it, and may be better than even the newest PD models. The included "Charge Wizard" is of course useless with LFP batteries. It's here:
http://www.bestconverter.com/PD-4655...te-_p_677.html
The Victron all-in-one power centers are the very best in the business, but they would require a complete replacement of the WFCO Unit. The MBA Wildkat is a 30-minute upgrade job, replacing just the converter section within the WFCO panel.