I am currently 5'8" 175lbs and 25 years old. I have only recently come to really understand and implement Jim's four principles using 531 with BBB two days a week. However, one weakness still hinders my progress, and that's my deadlift. I would really like to continue pulling conventional because that is what Jim suggests and want to give his program an honest try.
But, sumo feels much more natural to me and I can keep back flat much better. I'm not sure if my conventional form is close enough to keep pushing up the weight. I do feel it a little bit in my lower back after the work and BBB sets. I put links to my last two 531 weeks as a reference.
Thanks for any help you can provide.