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When I do the deadlifts I start out by mostly driving with my legs first and then using my back. When I get tired I think I tend to not squat down as far and mostly use my back.
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This sounds bad. First of all you do not "use your back" in deadlfits. You finish the lift with a hip extension not a back extension. The back is just playing a supporting role. Sometimes that role is harder than others but you do not use your back as a primary mover.
It sounds like you are both not performing the lift correctly and you are either letting form break down or changing the way you lift in response to fatigue. That is not how to do things. Form doesn't change. If you are so fatigued that form cannot be maintained...it is time to stop.
If you want to go for a certain volume then the weights will have to be lowered so you can get that volume with correct form. Otherwise stop when quality breaks down.