PT that is interesting about how the current changes the IR. (which is listed as a bit higher than an AGM's) I suspect that is poor wording for what goes on, but you do get recharged in a shorter time using the higher current for sure.
I have been using the 20 amp Renogy DC-DC setting of 14.7v and the solar is adjusted to 14.7 to match that (so they add their amps fully) to recharge while driving around and get 30 some amps total mid-day.
Solar is low amps (255w on the 200AH bank) so it is good to know the batts still get charged ok even if it takes longer and there is no minimum amps spec like that 20% for Lifeline AGMs and the 20% Trojan recommends too for their AGMs.
They are not exactly flying off the shelf at Azimuth looks like. Must be time for PT to make them an offer! :)