there is nothing wrong with doing partial harvest and waiting longer for the lower buds to ripen, i say if you have the time do that, if not harvest it all and be done. i do a bit of both, one of my last harvest i took the ripe buds off and waited a bit longer for the bottom buds, it works great and thats how i prefer to do things but sometimes i take the whole plant so i can make room for the next batch. in the end it boils down to if you have the room and the extra time, yoi already came this far what is a week or so longer for the bottom buds?