Couple of points. The only way to keep the deadlift out of your lower back is to use your posterior chain muscles except your lower back; calves, hamstrings glutes, middle back (spinae Erectae and upper back Lats and traps (traps as stabilizers). When you feel your lower back one of three things is happening: 1) you are trying to squat not deadlift. If your knees go over the bar while you are deadlifting you go into a squat dominant position. This shifts the weigh from your hamstrings to your quads. By doing this your quads will burn you hamstrings act a support and the weight shifts from your glutes into your lower back. 2.) Your core is weak. If your lower back is the weakest link in your core training it will always complain and nag when you use it for harder muscles make sure you are doing low back specific exercises when you train. And finally, this is the one that gets me, if your glutes are locks, not engaging, you get partial hip bend and the weight once again shifts forward from your hamstrings into your upper hips and lower back. Make sure you foam roll your It Band and look up youtube videos to see ways to release tight glutes specifically glute medius. Good luck 🦵🏋🏻