When doing lat pulldowns or chinups (both with wide grip) I find that I can't seem to pull the bar down or my body up to the point about where my upper arms are approximately parallel with the floor. That is, when doing pulldowns the bar stops several inches above my chest. It seems like I would want the maximum range of motion (i.e. getting the bar to touch my chest). However, when I drop the weight enough so I can get the bar all the way down, I find them to be too easy (with good form, going very slowly). So I was wondering if I should be doing partial reps with lighter weight just during the weak area in the pull. What do you guys think?