NO converter has charging voltages that match Trojan specs.
If you charge from a generator I recommend IOTA or Progressive Dynamics. These two converters hold a higher voltage for the absorption charge.
Powermax drops voltage to 13.6 at the end of the bulk charging phase at about 70% charged. This makes for an extended period in absorption. For mostly plugged in Powermax works fine by the posts I read. I would go smaller at 35 amps or 45 amps to extend the bulk charging to a higher % charge.
Any of these will be far better than the WFCO.
If you expect to keep the batteries on a float charge I believe your switch must be on.