Re:Back routine- width Vs Thickness...splitting it up?
i'd rather have heavy-light split days for back. do width an thickness on both days, 50/50.
on heavy i'd go with heavy rack pulls, some bent over rows (could also be chest supported tbar) in rest pause fashion and 2 lat dominant exercises (chins and pulldowns for example).
and some machine/ isolation work on a light session (straight arm pulldowns, pullover machine, double cable pulldown, machine rows etc), in a 12-25 rep range
when training back, it's very important to encorporate as much mind-muscle connection as u can. meaning 1-2 seconds static contractions, very controlled negatives, 1 sec in stretch position, etc. that way the back muscles will be maximally recruited, opposed to just moving a weight from A to B