My goal would be to beat that number on the sixth workout, so I add 5-10% and set that as the weight for the last of the six workouts. Then I subtract 5% and round off to the nearest five pounds for each workout leading up to that, so it would look something like this:
155, 160, 165, 175, 185, 195
You don't want to try and start with your max because after an SD period your strength will have dropped somewhat, which is actually a good thing and one of the basic HST principles. SD makes your body respond to lighter weights again, but then you need to keep adding weight every workout until you progress beyond your previous max, which in my case usually occurs by the fifth workout.