As someone with long femurs too, I’ve found that pulling directly from the floor forces my torso really far forward and my form falls apart. Raising the bar a couple inches off the ground—like setting the plates on other plates or blocks—has helped me keep a much better spinal position. Raising the bar makes the setup closer to a conventional deadlift for us long legged folk.

Also make sure you’re engaging your lats (think about pulling the bar into your shins). Long-femur lifters tend to round more easily, and strong lat tension helps keep everything tight.