Lifting 90% or more of your max for more then 2 weeks can actually be counterproductive of your goals. Take 80% of your max, do whatever set/rep scheme you wan't and add 2.5% every week. Example:
Week 1: 80%
Week 2: 82.5%
Week 3: 85%
Week 4: 87.5%
Week 5: 90%
Then Deload