The Main reason most people's deadlift stalls out and never increases is because they are not taking enough time to recover. the lower back muscles take 100 hours to recuperate with optimal protein intake and sleep. Incorporate 7-10 days of CNS adaptation time and you are looking at a 14 day average need to recover from a deadlifting session. I recommend deadlifting no more than twice a month (one week on/one week off). On the off weeks, do some light, unweighted lower back hyperextensions, not heavy enough or high enough reps to cause microtears in the muscle fascia but just enough to assist in CNS adaptation of lower back muscle fiber recruitment.
