I deadlift every 3 weeks and normally increase by 20 pounds so today I was planning on going from 355 to 375 but instead I went from 355 to 365 and when I pulled it my legs wobbled so much, it never does that, and I felt my hammy pull which I never felt before during the lift. I was just wondering what could have caused this to happen? I been under stress allot but I'm normally under stress so its nothing really different, would the shoes cause this because I went from using new balance to converse shoes today. Also I wiegh 163 deadlift- 365, Bench 195, Squat 265, I started lifting heavy about 8 months ago, how am I increasing? am I good for just being a beginner or am I not gaining enough for the time I have been in the game so far?