BB rows with a middle curl grip, pulling into the lower abs. Also try the 45 degree version, that some very big men do as a core back exercise. Power cleans from either a power rack or a hanging position. Do a search if not sure of the lifting style. Include Hi-Pulls also if cleans are not your thing. Or both in the same workout for that matter. Can also try heavy DB cleans and Hi-pulls (prefer one arm at a time) which a lot of folks seem to forget. It is a mass builder.
I would mention the DL but this exercise is not meant for every BB'er. With some, it can cause more harm than good, in the long run, when done from the floor. This is where partials comes in with regard to using very heavy weight. Starting from a higher position, less strain on the lower back is reduced for a lot of BB'ers. Actually I, on a personal note, prefer the SLDL. If doing any form of the DL, try a wider hand spacing, from time to time. Something like collar to collar for a different feel & stretch to the exercise. Good Luck.