nice work bro. keep pulling. i think that you should start training heavy. start going for singles. do singles and keep upping the weight until you can't go up any more.
IMO when it comes to deadlift training (if one is desiring a 1RM) i do not feel that it is necessary to work reps. many times (over 95% of the time) after each rep, you are not back to your ideal starting position. unless you take a second to reset yourself, and set your marks, you could end up hurting yourself by pulling from an undesirable postion. also, when it comes to deads, you are moving a dead weight (hence the name, deadlift) as opposed to squats and bench press where you have to reverse the direction of the weight. since the only part of the deadlift that you are concerned with is the pulling of the weight off the floor, there is no need for reversal strength. since there is no need for reversal strength, is there a need for working reps on the deadlift? IMO the answer is no.