I never did overcome the Mopar low voltage at idle issue using any of the Mopar alternators. I even tried the smallest pulley I could find on the alternators.
I stumbled across the adapter bracket to mount a CS 144 on my car. It puts out 135 amps at a slow idle and over 200 amps just off idle. Yes, I did upgrade my wiring to accommodate the heavier amp load by using a lot of the Mad Electric theory. . I was not after the peak output, but wanted more amps at idle.
No one has ever noticed that it's a non=Mopar unit.
Need to note your alt will never provide more than the car needs at iddle or revving up! You can get 800 amps alt if you want, but if your car ( along with the batt if discharged ) requires 55 amps while iddling because you have fans and whatever else, the alt will provide JUST 55 amps. The alt specs just says is ABLE to provide the output at certain speeds, but not that will PROVIDE it as a steady output.
The tests made on bench are being full fielded to provide its max output over the speed curve.
And more than voltage issue is really amperage issue, just that at certain amperage failure, then voltage begins to make somehow a proportional failure, but when you get the voltage variation, amperage began to fail way earlier.
