what part of your upper back do you feel is weak?
sorry if im stalling for bfold to come in and offer up some help. Jt Iron has some great ideas too.
the point im getting at is, what is breaking down in your stones? upper back stability, holding power, etc.
face pulls will be alright for rear delt work, and mid traps. if you are looking for more lat, you might want to lower the angle of your elbows and row more, or even implement some pullups for direct lat strength. though i respect the whole "in the same plane" argument, with regards to rowing vs. pulldown/pullup, its a fresh change to throw in some heavy pullups. IMO.