Looks like a crappy program. If I'm going to max I do as many warmups as required nowhere near failure, and I go for my max.
If you can do 315x6 you should be able to get 325 for more than two reps, unless you mean your second set or something in which case you are just tired. If that is fresh, then you need to train heavier, doubles/tripples for a couple weeks. 5 reps or less though requires mixing things up to keep the CNS from reaching a point where your lifts actually drop.
Find any weak points and eliminate them. When I was training heavy for flat bench I would do 3-4 working sets of flat bench and roughly 2 for incline, no fly movements or additional dumbell movements, then heavy triceps work like close grips and so on.