If you are stagnating in your back development, you might want to think about doing this:
For one macrocyle (so maybe 4 weeks with an unload week the 5th), switch an upper body pulling variation to your ME exercise. So your ME days might look like this:
Week 1- Bentover Rows
Week 2- Weighted Pullups
Week 3- Bentover Rows
Week 4- Weighted Chin Ups
Usually for pulling variations a 5RM works better than a 1RM, but you might be able to do 3RM stuff depending on how advanced you are. Give that a whirl and see if you can bust through some plateaus.