Last back workout I really dropped the weight and would go all the way up on pulldowns. Pull down to halfway and pause. Then continue all the way down and pause. Would just repeat with light weight till my back was toast. Still fukin having trouble with thickness though. Going to keep plugging along.
Where are you lacking thickness exactly?
There are some cues you should make use of on your back lifts to help expedite results:
[1] Create a pre-stretch on any bent over single armed movement (one arm bb row, dumbbell row (single arm), etc). Tilt the hip of the arm your working a little higher so the range you have is a bit greater that an even hip level would provide. Work the weight deep down into the stretch, and drive up explosively.
[2] You can do the same thing with any pulldown variants, work the stretch at the top of the ROM, let it stretch you out fully (control the eccentric though) and drive down hard. Smooth traction on the eccentric at all points working your way deep into that stretch at the top.
[3] If it's middle back thickness you're lacking, make sure you contract hard at the top of the ROM on any row movement you do. Bent over barbell rows, squeeze at the contracted position and drive up explosively. Control that weight that, and try to drive it up quickly.
[4] Use bands to create a harder contraction. Use them on the chest supported row / t-bar row machine or even on single arm dumbbell rows (I love this one). For dumbbells, take a heavy resistance band, lay it out horizontally on the floor, step on it with your foot, and place the loop of the band over the dumbbell. Grip that shit, keep it smooth as fuck at all times, never shaky, and get a full stretch at the bottom, but drive it up and get a hard contraction.
[5] Do some work to address lower traps and rhomboids. Anything with a pronate grip and straight arms (flared out almost?) will address this. Chest supported rows with a pronated grip, face pulls to your chest (with a band), pronated single arm barbell rows, are all options.
Incorporate these cues and you will be mind blown at how smooth your movement and traction is on pull movements and how efficiently everything is being worked.
Once you've mastered that, throw in some high intensity techniques.