the first times you run through you probably shouldn't increase maxs- but if you get to week 4 and the 85% and 80% sets all move fairly comfortably you might be able to add some. There are a few ways to do this- either add to the 1rm or just at to the top sets. Sheiko himself says when it gets easy the first set is either to add a set or add reps- which increases volume- but understand that adding reps is better for building capacity and strength endurance, whereas sets will increase overall volume- or you add weight- which increases loading. I normally add loading- but only for a few sets with the top work sets.