Your back sounds as weak as mine. Make your deads workout first thing in the week when you are at your best and get the most out of it.
It took me years to figure out what split worked best for my body. I was always too wrecked after squats or deads to work the second half of my workout properly.
So I tried some different things and right now I have this 3-day split that works for me and my schedule (competing in Scottish games and rugby):
1-chest and back and hams
2-leg and abs
3-shoulders and arms
On back day I will hit 3 of the following 5 movements:
I should actually say 2 because I almost always include deads or db deads in my back workout.
I hit hams on back day after I finish up the deads. I don't have access to a GHM so I do leg curls.
On leg day I hit squats, leg press/hack squat and then leg ext. When I am done I head back to the leg press for calf raise drop sets and then seated calf raises to failure.
This is what I aim for right now. Take what works for you ?this just happens to have worked for me.
Drop back to my second set weight and knock out 20 reps...yes 20.
2 leg press/hack squat superset
Use a weight that you could do for a 'tough 12'
3 drop set leg ext
~I drop the superset and keep leg presses as #3.
~I drop the sets to know more than 4-5 and the reps to 8 or less
I cut the movements to 2 per body part during the in season and add some oly movements. I need the recovery time in between comps...over training is easy to do.
I knock the sets and reps down and work on moving 75-80% of my 1RM at speed for all the sets, 3-4 reps per set. Working on quickness as well as staying in good form.
This works for me. Maybe it will help you as well.