RE: Deadlift 1 RM attempts
I think working triples or singles like M5 has mentioned is the best way. Work up to 90% of your current 1 rm for 4 singles. Begin by working in triples, then when you get to about the 120 mark, drop to singles and do 4 single reps at 135k. Do this for 3 weeks and then have another go at the 150's, then try the 155's or even 160's.