As far as your training, I don't think I could do heavy squats and DLs back to back with any sort of success. Hell, I can hardly do a heavy upper right next to a heavy lower day without something being affected negatively. But I mean if you really are putting up numbers like you say you are then you obviously have been doing something that has been working for your body.
I've actually just recently been cleared to do all cardio besides weighted cardio (farmer's walks, sled dragging) and running, so I may adjust my program into more of a typical three day full-body schedule with cardio on 2-3 of the off days.
Just in case you guys were curious I'll include my totals...my upper body is quite weak compared to my lower body. Actually just a few months ago I finally broke the 225 bench plateau but now it seems to be moving quickly.
Squat - 490
Bench - 255
Deadlift - 495
Squat - 585
Deadlift - 405 -- haha I need to figure this one out
Bench - N/A
I also just noticed the 455 looks really sketchy form wise, the video was taken a few months ago and at that point that was my max. I uploaded a video of 315 x 15 to show what my form generally looks like. I didn't even notice how bad I was straight legging it in the 455 vid.