I've been playing with exercises and I can definitely tell when one isn't right. There's this extra strain I feel in my abdomen. As for the placement in the routine, it helps keep the weights a bit lower. I've been as high as 515x15 with my deads in the past. So, relatively speaking, 405x3 isn't terribly heavy for me. Since that was still a sub-maximal effort set (I feel like 455x1 could have happened), I'm going to use it as the set to calculate my training max for a 531 scheme (445). I'm going to use it for deads alone and I'm planning on skipping deload weeks since I'm doing deads every other week. So, I'll be doing a new rotation every 6 weeks which is less than a normal 531 routine (every 4). I'm excited to have deads back. The heavier weights shock the nervous system which is neglected in a scheme like this one. As always, I need to be careful and very aware of my body.