Ok, so I'm going too fast?

5 pounds every workout is too much then?

After that whole year and a half on rippetoe's I left off at low numbers like 170 squat, 100 bench.. that's where I picked up when I restarted this new one. I was progressing really good with deadlifts and then all of a sudden I couldn't lift it fully anymore, so I guess I'll drop it by 20 pounds and go from there?