At least drop the arms from one of those days. IMO you should add in ab work. Squats and deadlifts will be strengthening your core stabilizers of course, but IMO it is best not to neglect abs when you are doing back work.
If you've ever taken a misstep while doing squats or even barbell calf raises and had the weight shift backward then you'll realize it was your torso muscles that saved you from a nasty accident. Such muscle actions are involuntary so if there is a deficit in one side or another that can lead to injuries.
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