"Yet for even faster charging (say, at home in RV garage) I also have on-board a ProSine inverter (w/100a charger), but the maximum amount of charging amps I’ve ever witnessed going to the Li battery is 67amps and this was while the battery’s beginning SOC was at about 40-45’ish %."
This could be from wiring inverter to bank, but more likely low 120v voltage input to the charger. I see that at home where my converter will still operate with the long extension cord from the house, but it does lower amps than usual and the input voltage is below the required 105v specified.
Not surprised the PD 45 amper does less than 45 after all the threads we had on that a few years ago with Salvo and the gang being hot on that. that one might have a wiring issue common to RVs making matters worse.
The OP never mentioned what amps he actually gets from his when he gave his charging time for a 50-90, but it would have been closer to 45.