It's good to hear that you followed the program to the letter. It's just that if you want it to be easier (and more probable) for me to give advice, it helps if I see what you did in a form that's as easy to read as possible.
I'm sure you appreciate honest input, so I'll say that it was clear in the beginning of the bigger lift that you wouldn't get it, and the 355 lift wasn't pretty either. But of course, Prs are never pretty.
What was your previous PR before 355? (I tried to ask about it earlier on...)
Have a look at how Chris Duffin teaches the deadlift on Youtube in his Supertraining video, and make sure you get his idea behind bracing as well.