AFAIK (not much) if the PD goes to 14.4 by itself at the start of the recharge, it will stay at that for the time it takes to get the batts to about 97% then drop to 13.6, even if that time is less than four hours, say three hours.
But if you manually put it to 14.4 it goes by a timer for a fixed four hour run at 14.4 and then drops to 13.6 regardless of the state of charge.
So if you think you are at 97% after three hours having used the manual method, then you can use the manual method to put it to 13.6 yourself. If it is not to 97% by the time the four hours is up and it drops to 13.6 you can hit the button again to finish the job at 14.4.