I have to agree with the last comment, particularly in regards to squats and deads on the same day. Good way to kill the CNS and hamper growth.
HT, I understand your point about 5x5, I know many people who have had great success with it. However, don't overdo it you need no more than 4 big lifts a day, plus some abs if you want. Use the KISS principle, 2 upper/2 lower or 3 full body, eat, recover, repeat. That may sound too simple to you, but just keep in mind quality over quantity.
Squat or DL
Quads or Hams
Nice that you are going ATTG on squats, but it's not necessary, just get into the hole below parallel. Set up the pins so you know where that is, tap them and get out of there. The only time you need to go that low is the bottom of a technical clean or snatch.