I switch between Pulldown work and row work frequently. I used to do pull ups, however I feel I have more control doing pulldowns, but thats me. I am a huge fan of pullups though.
Anyway heres what I do, I will use Bent over rows here first.
1 warmup 45's a side 15 reps slow
3 working sets working my way to 225 for 12 reps with a slight hold at top. I always pull back with my elbows, helps me concentrate more.
3 sets of dumbell rows 100's for 10-12 reps. I bring the dumbell to the lower half of my torso, again pulling with my elbow, very controlled.
3 sets of barbell shrugs.
1st set 225 for 15 reps w/ 2-3 sec hold at top. I work my way to 315/375. On my last set I superset w/ 100lb dbels for as many reps as I can. I believe in holding the weight as high up as possible and squeezing as hard as possible.
6 sets of pull downs.
3 to the front and 3 using close grip bar.
I really dont go insane here w/ weight. This movement is easy to screw up if you dont use perfect control. In both movements as I bring the bar down I extend my chest out and force my elbows back. I then lower the weight slowly w/out ever fully extending. This is pure torture!!!
thats it, very simple, doesnt take long. I really dont rest, my partner goes and then Im right back in doing my set. As for lower back, I get plenty of work doing bent over rows and SLDL on leg day for hams.
I will tell you what Frank told me which I have neglected for years....the seratus( spelling) He would do 4 sets pof pullovers on a bench with feet on floor. Im assuming you know of these. I have been doing them for 3 months now, never heavier than 75's. Let me tell you, when you hit a side oblique pose...NOTHING looks better than having your seratus look like the teeth of a hungry lion. I do these either on chest or back day, depending how I feel. Peace.