I have a lot of discomfort/pain in my SI. I need to see a sports doc more than likely. Anyways, I had a lot less pain when I was doing elevated pulls, and I was a lot stronger. Since religiously doing deads off the floor my strength has dropped considerably. I used to do rack pulls/elevated deads almost exclusively which translated into a bigger deadlift, now I pull conventional off the floor and have been progressively getting weaker or stalling, even with 5/3/1, deloads, resets, etc. It might be worth it to drop the deadlifts for a while. My back was bothering me so I stopped for about 6 months, my max was a lowly 365, down from 495. I pulled a couple weeks ago and *drumroll* 365 went up easily. Squat, SLDLs, Olympic lifts, etc translate well to deadlifts IMO. YMMV.