On your screen does it show the ability to dump the remaining bales? I have 72% left but dont see an option to force the bale out.
At the moment, it does not support "Unload Early", however it is on my list of things to add with the first full update.
With this pack, all the balers function the same as the base game just a little faster and the custom bale capacities.
My other baler mod (Lizard ProBale), I got more into the special options like additional bale sizes, custom pickup widths and early unload.