I think it depends on the application to your routine. For example, right now I'm doing a 4 x 6 set/rep scheme. Say last week I had benched 145 for all 4 sets. This week, I might do 145 on my first set, then 155 for sets 2 and 3, and maybe even 4 if I can make it. Then the next week, I do 155 for all my sets. Maybe not at that pace, but you should see what I mean. Just what has been working for me...